Oklahoma State Physics Department
Seminars and Colloquia
January through May, 1995
(updated March 7, 1995)
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Seminars and Colloquia, Typical Week:
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Date: Thursday
Time: 1:30 PM
Place: Classroom Building, Room 106
Inquiries: physmas@mvs.ucc.okstate.edu
physsna@mvs.ucc.okstate.edu
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Physics Colloquium:
Date: Thursday
Time: 3:30 PM
Place: PS 110
Inquiries: jhhp@jperk.phy.okstate.edu
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Date: Friday
Time: 1:30 PM (This semester)
Place: PS 147
Inquiries: jhhp@jperk.phy.okstate.edu
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Oklahoma State Physics Department
Seminars and Colloquia, January 2-13, 1995
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No activities: Prelims and Orientation
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Oklahoma State Physics Department Seminars
and Colloquia, January 16-20, 1995
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Center for Laser Research Colloquium:
Speaker: Prof. S. C. Shen
National Laboratory for Infrared Physics
Shanghai Institute of Technical Physics
Chinese Academy of Sciences
Date: Tuesday, January 17, 1995
Time: 3:30 PM
Place: 108 NRC
Title: Quantum-Well Infrared Photodetector
Based on Intersubband Transitions
Abstract:
The quantum-well infrared photodetector has
been developed based on GaAs/Ga_{1-x}Al_{x}As
heterostructures. The transitions between
the confined subbands of charge carriers to
quantum-well layers lead to new developments
in semiconductor infrared photodetector
performance. The performance of the
quantum-well detectors based on the
GaAs/Ga_{1-x}Al_{x}As multiple quantum-wells
has been investigated and compared with
that based on Hg_{1-x}Cd_{x}Te alloys.
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Not Scheduled
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Physics Colloquium:
Speaker: Prof. S. C. Shen
National Laboratory for Infrared Physics
Shanghai Institute of Technical Physics
Chinese Academy of Sciences
Date: Thursday, January 19, 1995
Time: 3:30 PM
Place: PS 110
Title: Direct Experimental Demonstration
of the Linear Composition of
Wavefunctions for the
Hybridized Electronic States
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
By taking Zeeman states of impurities in
semiconductors under magnetic field as
examples, it is directly demonstrated
by spectroscopic measurements that the
wavefunctions of strongly interacting
electronic states are really mixed and
linearly recomposed according to the
fundamental assumption of solid state
quantum theory. The conditions and
the evolutions of the wavefunction
recomposition for such strongly
interacting and hybridized states are
revealed experimentally and discussed
in the light of fundamental perturbation
theory.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Not Scheduled
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Oklahoma State Physics Department Seminars
and Colloquia, January 23-27, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Bhaskar Dutta
Department of Physics, OSU
Date: Thursday, January 26, 1995
Time: 1:30 PM
Place: Classroom Building, Room 106
Title: In Presence of an Extra U(1) ...
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Physics Colloquium:
Speaker: Dr. Igor E. Protsenko
Lebedev Physics Institute
Moscow, Russia
Date: Thursday, January 26, 1995
Time: 3:30 PM
Place: PS 110
Title: Quantum Fluctuations
in Coherent Radiation
and Laser Devices
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
Presentation includes short historical
review, description of squeezed states
of light and their applications,
introduction in modern theory of
quantum open systems, discussion
of optical noiseless amplification
and sub-poissonian laser generation.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Not Scheduled
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Oklahoma State Physics Department Seminars
and Colloquia, January 30-February 3, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Not Scheduled
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Physics Colloquium:
Speaker: Dr. Mark S. Akselrod
Visiting Professor at
Oklahoma State University,
Head of the Laboratory of
Dosimetric Devices,
Urals State Technical University
620002, Ekaterinburg, Russia
Date: Thursday, February 2, 1995
Time: 3:30 PM
Place: PS 110
Title: Solid State Detectors of Radiation
Based on Anion Deficient Al2O3
Crystals:
Fundamental Research and Application
for Personnel and Environmental
Monitoring of Radiation.
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
Solid state dosimeters based on electron
and hole recombination processes in
dielectric crystals and glasses have
become the most widely used.
Non stoichiometric oxide investigations
using exoemission, luminescent, optical,
and ESR spectroscopy methods were carried
out in Russia and the USA for about
15 years. Aluminum oxide attracted
scientific interest due to its high
optical, chemical, and thermal stability
under irradiation. It was a challenging
idea to make it sensitive to radiation.
It took ten years to go from fundamental
research to a commercial product. Now
Al2O3 detectors are the most sensitive
and promising detectors for different
application in dosimetry.
The presentation will cover the
following topics:
- radiation effects in crystals;
- fundamental principals of
thermoluminescent (TL) and
exoelectron (EE) dosimetry;
- problems of crystal growth and
creation of point defects;
- properties of some commonly
used TL and EE detectors;
- aluminum oxide single crystals
as a TLD material;
- the latest developments of thin
layer Al2O3 detectors for
beta dosimetry;
- some problems to be solved
in solid state dosimetry.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. Jacques H. H. Perk
Department of Physics, OSU
Date: Friday, February 3, 1995
Time: 2:00 PM
Place: PS 147
Title: Ising Field Theory
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Oklahoma State Physics Department Seminars
and Colloquia, February 6-10, 1995
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Center for Laser Research Colloquium:
Speaker: Dr. Yongqian Liu
Center for Ultrafast Optical
Science and Technology,
University of Michigan
Date: Tuesday, February 7, 1995
Time: 9:30 AM
Place: 413 NRC
Title: Probing Electronic and Phononic
Processes with Femtosecond Lasers
Abstract:
Ultrafast femtosecond lasers provide a
unique tool with which to study electronic
and phononic processes in real time. In
this talk, I describe ultrafast phenomena
associated with several superconductors
and ferroelectric substrates which are
investigated using a femtosecond Ti-sapphire
laser. Techniques applied include direct
optical pump-probe spectroscopy, as well
as the use of optical pulses to generate
terahertz electromagnetic transients.
Several aspects of the results will be
presented, including the observation
of coherent phonons in LaAlO_3, which
is dominated by boundary effects;
nonequilibrium quasiparticle relaxation
processes in superconducting films of
YBCO and BKBO and single crystals of
NCCO; electrodynamics of superconducting
electrons in the terahertz regime; and
the distinction of thermal and quantum
response of superconducting YBCO and
BKBO films via direct probing of
quasiparticle generation. Implications
of the results for practical applications
will be discussed.
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Mark A. Samuel
Department of Physics, OSU
Date: Thursday, February 9, 1995
Time: 1:30 PM
Place: Classroom Building, Room 106
Title: Testing the Standard Model
in Higher Order
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Physics Colloquium:
Speaker: Dr. Kieran Mullen
Department of Physics, OU
Date: Thursday, February 9, 1995
Time: 3:30 PM
Place: PS 110
Title: Superhexatics:
The Spatial Ordering of
Helium in Superfluid Films
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
Helium films have been a source of
interesting physics, including
two-dimensional melting, wetting
phenomena, and superfluidity.
Although one of the simplest systems,
it still contains new surprises.
Recent experiments on superfluid films
have shown a variety of unexpected
behaviors, such as submonolayer
superfluidity and anomalous phase
transistions. These experiments have
prompted theories of new, highly
ordered, superfluid states, such
vortex-antivortex lattices and
superhexatics. This colloquium will
discuss some of the new physics
of helium films, review the
Kosterlitz-Thouless (KT) theory of
two-dimensional melting, and finally
discuss how KT theory might be
generalized to cover recent experiments.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. Jacques H. H. Perk
Department of Physics, OSU
Date: Friday, February 10, 1995
Time: 1:30 PM
Place: PS 147
Title: Ising Field Theory II
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Oklahoma State Physics Department Seminars
and Colloquia, February 13-17, 1995
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Center for Laser Research Colloquium:
Speaker: Haike Dong
University of California
at San Diego
Date: Wednesday, February 15, 1995
Time: 9:00 AM
Place: 413 NRC
Title: Chemical Beam Epitaxy and
Laser-enhanced CBE of GaAs and
InGaAs Using Novel Gas Sources
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Cancelled
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Physics Colloquium:
Speaker: Dr. Lionel M. Raff
Head, Department of Chemistry, OSU
Date: Thursday, February 16, 1995
Time: 3:30 PM
Place: PS 110
Title: Statistical and Nonstatistical
Effects in Unimolecular Reactions
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
Under certain conditions, statistical
mechanics provides some extremely powerful
methods for the computation of rigorous
upper bounds for the reaction rates of
unimolecular and bimolecular processes.
In many cases, these upper bounds are
close to the true values. Examples of
such methods include transition-state
theory, variational transition-state
theory, Rice-Ramsperger-Kassel-Marcus
(RRKM) theory and classical variational
phase-space theory. The underlying
assumption upon which such statistical
theories rest is that all points in
phase space with energy E are sampled
with equal probability.
Theoretical work in our laboratory
over the last five years has shown that
the statistical assumption does not hold
for many reactions involving polyatomic
molecules. In such cases, statistical
theory no longer gives a rigorous upper
bound to the true rate. We have recently
found that nonstatistical behavior may
be divided into two classes, one of
which comprises those systems which fail
to explore all of the energetically
accessible momentum space in a
statistical manner and a second
comprising those systems that fail
to sample all of the energetically
accessible configuration space in a
statistical manner.
We have developed some theoretical
methods that permit a relatively simple
qualitative assessment to be made to
determine if a system exhibits statistical
or nonstatistical behavior. Finally, our
results have permitted us to formulate
some guiding principles to permit accurate
predictions to be made without the actual
execution of theoretical calculations.
The seminar will present an overview of
this work.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Not Scheduled
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Oklahoma State Physics Department Seminars
and Colloquia, February 20-24, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Bhaskar Dutta
Department of Physics, OSU
Date: Thursday, February 23, 1995
Time: 1:30 PM
Place: Classroom Building, Room 106
Title: b to s Gamma in SUSY
(bottom to strange and Gamma)
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Physics Colloquium:
Speaker: Warren Grider
Department of Physics, OSU
Date: Thursday, February 23, 1995
Time: 3:00 PM (Note earlier time)
Place: PS 110
Title: Safety Exercise
Abstract:
The university is tightening up its
safety regulations, requiring that
all members in a department with
hazardous materials undergo mandatory
safety instruction as stipulated by OSHA.
All faculty and staff, including TAs
and RAs and secretaries, have to attend
and take two written tests. Those who
cannot attend will have to make up at
the earliest possible occasion.
This new regulation is a result of
the accident with the two painters
who sued the university recently.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. Evgeny A. Viktorov
S.I. Vavilov State Optical Institute
St. Petersburg, Russia
Date: Friday, February 24, 1995
Time: 1:30 PM
Place: PS 147
Title: Saddle Antiphase Dynamics
in a Multimode Laser
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Oklahoma State Physics Department Seminars
and Colloquia, February 27-March 3, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Satya Nandi
Department of Physics, OSU
Date: Thursday, March 2, 1995
Time: 1:30 PM
Place: Classroom Building, Room 106
Title: Theory of Fermion Masses
and Mixings
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Physics Colloquium:
Postponed to April 6, due to snow.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. Helen Au-Yang
Department of Physics, OSU
Date: Friday, March 3, 1995
Time: 1:30 PM
Place: PS 147
Title: Exact Results for
Chiral Potts Model
and Implications
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Oklahoma State Physics Department Seminars
and Colloquia, March 6-10, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
OSU Spring Break: No seminar scheduled.
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Physics Colloquium:
Spring Break: No colloquium scheduled.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Spring Break: No seminar scheduled.
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Oklahoma State Physics Department Seminars
and Colloquia, March 13-17, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
OU Spring Break: No seminar scheduled.
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Physics Colloquium:
Speaker: Dr. Art Lucas
Department of Physics, OSU
Date: Thursday, March 16, 1995
Time: 3:30 PM
Place: PS 110
Title: The Estimation of Radioactivity
in the Environment
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
During the period 1940 to 1990 extensive
effort was expended in the United States
to develop nuclear fuels and weapons. In
pursuit of this cause, a large number
of sites involved in the process were
contaminated with radioactivity. The
waning of nuclear power occurring with
the cessation of the cold war has
occasioned a requirement to clean and
secure these sites. Accordingly, much
of the effort originally dedicated to
building the facilities is now being
redirected to the cleanup. Some impact
on the teaching programs of technical
colleges and universities is already
evident and further change is expected.
The current national needs for cleanup
of radioactivity in the environment will
be summarized. Simple rules for linking
the indications on available instruments
to fundamental quantities indicating the
extent of contamination will be discussed.
Development of an algorithm for
assaying alpha particle emitters in
unprocessed samples will be discussed.
Examples will be presented for separated
plutonium and uranium along with typical
decay products of the naturally occurring
radionuclides.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Several Fifteen Minute Talks
Date: Friday, March 17, 1995
Time: 1:30 PM
Place: PS 147
Title: Preparing for the APS Meeting
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Oklahoma State Physics Department Seminars
and Colloquia, March 20-24, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. H. M. Badran
Department of Physics, OSU,
and Tanta University (Egypt)
Date: Thursday, March 23, 1995
Time: 1:30 PM
Place: Classroom Building, Room 106
Title: Sensitivity of
Extensive Air Shower
to Gamma Ray Point Sources
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Physics Colloquium:
Week of APS March Meeting.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Not scheduled: Week of APS March Meeting.
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Oklahoma State Physics Department Seminars
and Colloquia, March 27-31, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Neville W. (Bill) Reay
Kansas State University
Date: Thursday, March 30, 1995
Time: 1:30 PM
Place: Classroom Building, Room 106
Title: A New Limit for Charm-Changing
Neutral Currents
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Physics Colloquium:
Speaker: Dr. Neville W. (Bill) Reay
Kansas State University
Date: Thursday, March 30, 1995
Time: 3:30 PM
Place: PS 110
Title: Neutrino Oscillations: Learning
Something New about the Neutrinos
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
Although neutrinos have been around for
6 decades, they are still the least
understood of known subatomic particles.
A major attempt is being planned to
determine whether neutrinos mix and
have mass; a positive result would have
implications for cosmology as well as
high energy physics. The motivation and
present status of this effort will be
discussed.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. Dmitrii Shalashilin
Department of Chemistry, OSU
Date: Friday, March 31, 1995
Time: 1:30 PM
Place: PS 147
Title: What is the Dream of Theoretical
Chemistry and Why it can not be
Realized?
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Oklahoma State Physics Department Seminars
and Colloquia, April 3-7, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Steve Gibbons
Department of Physics, OSU
Date: Thursday, April 6, 1995
Time: 1:30 PM
Place: Classroom Building, Room 106
Title: Collider Production of
High Spin Particles
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Physics Colloquium:
Speaker: Dr. John Hays
Department of Physics, OSU
Date: Thursday, April 6, 1995
Time: 3:30 PM
Place: PS 110
Title: Linear and Nonlinear Spectroscopy
of Zn_{1-x}Cd_{x}Se/ZnSe
Quantum Well Structures
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
Quantum well structures have many
applications as well as interesting
fundamental properties. The study of
these properties requires both linear
and nonlinear spectroscopy due to the
complimentary nature of these
techniques.
Linear absorption and photoluminescence
spectroscopy is applied to study the
linear properties of ZnCdSe/ZnSe.
Two-photon excitation spectroscopy
is used to probe those states which
are not single-photon allowed. The
combination of these techniques allows
the observation of the 1s and 2p
excitons and the determination of
the exciton binding energy.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Not Scheduled
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Oklahoma State Physics Department Seminars
and Colloquia, April 10-14, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Lee Sawer
University of Texas at Arlington
Date: Thursday, April 13, 1995
Time: 1:30 PM
Place: Classroom Building, Room 106
Title: Searches for New Phenomena
with D0 Detector
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Physics Colloquium:
Speaker: Dr. Penger Tong
Department of Physics, OSU
Date: Thursday, April 13, 1995
Time: 3:30 PM
Place: PS 110
Title: Scattering Experiments in
Mixtures of Colloid and Polymer:
Depletion and Adsorption
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
In recent years there has been a growing
interest in studying equilibrium properties
and non-equilibrium flow properties of
complex fluids. In this talk I will briefly
review some characteristic features of
complex fluids, and use mixtures of colloid
and polymer as examples to discuss
statistical properties of complex fluids.
I will report results of recent scattering
studies of interactions between colloidal
particles in polymer solutions. It is found
that the interaction between the colloid
and non-adsorbing polymer is repulsive,
which introduces a depletion-attraction
between the colloidal particles. The
experiment also shows that the presence of
adsorbed polymer on the colloidal surfaces
greatly reduces the depletion-attraction
between the colloidal particles, and
therefore enhances the stability of the
colloid-polymer mixtures.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. T. Narayanan
Date: Friday, April 14, 1995
Time: 1:30 PM
Place: PS 147
Title: Adsorption Induced Aggregation
of Colloids
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Oklahoma State Physics Department Seminars
and Colloquia, April 17-21, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. T. Hessing
CERN, Geneva
Date: Thursday, April 20, 1995
Time: 1:30 PM
Place: Classroom Building, Room 106
Title: New Techniques, Measurements
and Detectors at DELPHI
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Physics Colloquium:
Speaker: Dr. George A. Baker, Jr.
Los Alamos National Laboratory
Date: Thursday, April 20, 1995
Time: 3:30 PM
Place: PS 110
Title: Pade Approximants in Physics
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Dr. Baker is one of the pioneers in the
use of series expansions in critical
phenomena and high-energy physics. He has
written several textbooks on continued
fractions and Pade approximants which
have become the classics on these topics.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. George A. Baker, Jr.
Los Alamos National Laboratory
Date: Friday, April 21, 1995
Time: 1:30 PM
Place: PS 147
Title: TBA (Informal presentation
of recent work)
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Oklahoma State Physics Department Seminars
and Colloquia, April 24-28, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Stefan Boettcher
Department of Physics, OU
Date: Thursday, April 27, 1995
Time: 1:30 PM
Place: Classroom Building, Room 106
Title: Critical Phenomena
with Random Walks
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Prefinals week: No Colloquium
No Journal Club
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Oklahoma State Physics Department Seminars
and Colloquia, May 1-5, 1995
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Finals Week: No activities scheduled
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