Theoretical

Astrophysics.

Stellar evolution and nucleosynthesis. Brancazio.

Atomic Physics.

Electron and positron scattering; atom and ion scattering; excitation, ionization, and charge transfer; exchange effects; spin-dependent effects; density functional theory and its application to atoms; Compton profile studies; variational principles for quantum mechanical expectation values and density matrices. Franco, Halpern, Krieger, Mendelsohn, Sahni. 1 postdoctoral fellow.

Mathematical Physics.

Path integral methods; gauge symmetry; anharmonic oscillator, quark-quark forces; nonlinear quantum mechanics. Fanelli, Struzynski.

Nuclear Physics.

Intermediate energy physics; pion-nucleus in teractions; pion condensation; nuclear structure studies; relativistic many-body theory; quantum field theory and nuclear structure; effective interactions in nuclei; nuclear forces; offshell effects; nuclear bremsstrahlung and time delay; relativistic particle quantum mechanics; soft-pion theory and pion production; radiative decays; Clauber theory; charge transfer reactions; deep inelastic scattering of heavy ions; fusion; fission; statistical theory of nuclear reactions; nonequilibrium statistical behavior. Celenza, France, Lieu, Shakin, Sobel.

Solid State.

Transport theory in solids; deep levels in semiconductors; surface states; superlattices; metal surface physics; density functional theory with applications to the inhomogeneous electron gas near surfaces. Gruenebaum, Krieger, Sahni, Schwartz. I postdoctoral fellow.

Experimental

Applied Condensed Matter Physics.

Studies of bulk, surface, and interfacial properties of solids with an emphasis on semiconductors, metals, and ceramics, including high-T, superconductors. investigations of their application to photovoltaic cells, liquid junction solar cells, storage batteries, and a variety of electronic and optical devices. The latter include semiconductor and metal superlattices and heterojunctions, semiconductor lasers, infrared detectors, and MOS structures. Miyano, Moyer, Pollak, Tomkiewicz. 4 postdoctoral fellows.

Condensed Matter Physics.

Studies of fundamental properties of solids and their interfaces including electron band structure of semiconductors and transition-metal oxides; lattice dynamics; electron-phonon interactions; epitaxial growth of metals; semiconductor-electrolyte interfaces; semiconductor heterojunctions and epitaxy; quantum effects in superlattice structures. Experimental methods include modulated optical reflectivity, Raman spectroscopy, and photoluminescence, electrical characterizations such as impedance and deep level transient spectroscopy, UPS, Auger spectroscopy, EELS, RHEED, LEED, and STM. Also synchrotron-radiation-based techniques such as photoelectron spectroscopy, x-ray absorption fine structure, and x-ray standing waves. Miyano, Pollak, Tomkiewicz. 4 postdoctoral fellows .

Special Equipment and Facilities:

The laboratory facilities at Brooklyn College include fully equipped solid state, material science,and solar energy reserch laboratories. The laboratories possess a complete range of optical and modulated optical equipment including a laser Raman spectrometer as well as complete surface science facilities and a thin-film growth facility.

The optical and modulated spectrometers cover the range from the vacuum ultraviolet to theinfrared. Lasers for Raman scattering include a Coherent Radiation Laboratory (CRL) argon-ion laser, a CRL tunablelaser, and a Korad Nd/YAG high-power laser. Facilities existto perform experiments under a variety of external perturbations such as temperature (both high and low), uniaxial stress, hydrostatic pressure, and external magnetic fields (both standard and superconducting). The laboratories are fully equipped to grow and prepare crystals. This equipment includes ovens, crystal polishers, and conditioners, etc.

The surface science facilities include Ultra-High Vacuum system for high-resolution LEED characterization studies, Augerspectroscopy, high-resolution electron loss spectroscopy high radiation angular resolved photoelectron spectroscopy and scanning tunneling microscopy. The thin-film growth facility includes a Sputtering System with multitarget capability. Characterization of electronic materials is carried out at several synchrotron radiation facilities, including the nearby National Synchrotron Light Source at Brookhaven National Lab.

The solar energy laboratory is equipped with a complete range of electrochemical and photoelectrochemical facilities for characterization of the solid-liquid interface. These facilities include potentiostats, a wave form generator, rotating disk electrodes, a double beam spectral response facility, coulometers, multimeters, constant current and constant voltage sources, solar energy simulators, other light sources, and thermopiles for measuring the light intensity. The solar energy laboratory facilities also include two fully computerized impedance spectrometers that span a broad frequency from 10 microhertz to 10 megahertz, and a DLTS setup (assembled on site) for measuring the temperature dependence of deep trap parameters.

One of the best university computer facilities in the world is available to support the research activities of the Department. The University Computer Center is comprised of a network of three interconnected computers: an IBM 3090, an IBM 3081, and an IBM 4341, operating under both VM and MVS. The university computer are directly accessible from the college either by high speed batch mode or by interactive terminals for job editing, submission, retrieval, and file manipulation. The Department maintains a number of such terminals. The University Computer center is also linked via the INTERNET to most of the academic institutions in the U. S. and throughout the world. Brooklyn College also maintains its own Computer Center (an IBM 4381) accessible to students and faculty. Overall, the computer facilities available at Brooklyn College for both theoretical calculations and experimental data acquisition are extremely powerful and versatile.