Mark Roberson

Chemistry, Physics, Medical Physics, Astronomy and Math Instructor Vernon College Vernon, Texas 76384 Phone: (940) 552-6291 ext 2311 Fax : (940) 553-3902 Email: mroberson@vernoncollege.edu Office Hours: MWF10:00-11, M1-2, TTH9:30-11, 1-1:30pm W Office: Arts and Sciences Buildiing, Room 212

Abandon all hope ye who enter here. There is intelligent life on earth and its damn lonely.

Teaching Experience

Currently teaching freshman chemistry, physics and math classes and labs at Vernon College (1995-present).

Taught physics and astronomy classes at Texas Tech University (1994- 1995).

Also taught physics labs at Stephan F. Austin State University in 1989.

Degrees

Ph.D. in Physics in the area of quantum chemical simulation of semiconductors using large molecular clusters from Texas Tech University.

Master's in Physics which involved determining the infrared optical constants of phosphate molecules from Stephen F. Austin State University.

Bachelor's degree in Electrical Engineering from Texas A&M.

Associate of Applied Science in Engineering from Angelina Junior College.

• Astronomy class and lab.
• Medical Physics class and lab.
• Freshman Chemistry class and lab.
• Freshman Physics class and lab.
• College and Intermediate Algebra.

Post-Doctoral work

Developed software for the analysis of fundamental processes involved in the Deep Level Transient Spectroscopy experiemental method, a technique used in the study of semiconductors.

Code development for calculating properties of semiconductors from first principals using molecular clusters.

Broadened quantum chemical techniques to solid state applications by the use of atomic core potentials in large semiconductor molecular calculations.

Extending Ph.D. work of studying defects in semiconductors to the problem of Hydrogen in GaAs.

Ph.D. Dissertation

Application of quantum chemical techniques to the study of point defects in elemental and compound semiconductors. This includes basic defects structures and mobility of interstitial and intrinsic impurities (H and O in crystalline Si, vacancy-hydrogen interactions, etc.). Some of this work is related to the possible enhancement of solar cell efficiency. Developed FORTRAN codes to generate the geometry of molecular clusters for use in quantum chemical calculations.

Master's Degree

Investigation of the infra-red optical properties (such as the complex index of refraction) of some possible atmospheric pollutants (K2HPO4 and KH2PO4) using infrared spectroscopic techniques. Included in this work was data collection reduction and interpretation consistent with previous work in this field. This information is useful in studies of the concentrations and mobility of pollutants and related chemical interactions.

Undergraduate Work

Assisted in the design of a power supply with unique safety features for operating in a possibly explosive atmosphere. Used existing safety standards and test procedures to develop original tests for the power supply and used trouble shooting techniques to test the equipment. Used CAD system to pattern a 32-bit SRAM containing over 700 p- and n-channel devices. Used SUPREM computer code to model design processes to better study semiconductors. Aided in constructing transistors in the semiconductor processing labs at Texas A&M.

Computer Experience

FORTRAN and BASIC languages. Experience with VMS and UNIX operating systems, and with VAX, CRAY and RISC systems. Software: PRDDO and GAMESS quantum chemical codes, SUPREM process modeling code. CAD system for designing integrated circuits. Familiar with Tex and LaTex software used for technical writing.

``Hydrogen in Silicon: A Discussion of Diffusion and Passivation Mechanisms' 
(B.L. Sopori, X.Deng, J.P. Benner, A. Rohatgi, P. Sana, S.K. Estreicher Y.K. 
Park and Mark A. Roberson, published in Solar Energy Material and 
Solar Cells).

``Charge states of the Muon in GaAs.'' (T.A. Adams and Mark A. Roberson, 
R.L. Lichti, accepted by Phi. Mag.).

``Toward Macromolecular Quantum Mechanics: The Optimization of 
PRDDO/ on the NEC/SX3'' (D.S. Marynick, A. Derecskei-Kovacs, S.K. Estreicher, 
Mark A. Roberson, and D.M. Maric, Cross Cut (newsletter for CSCS) 1994, 3,#2, 
p1).

``Hydrogen and di-Hydrogen complexes in c-C, Si, Ge, and alpha-Sn' (Dj. 
Maric, Mark A. Roberson, and S.K. Estreicher, Phys. Rev. B, 50 p17018, 1994).

``Vacancy and vacancy-H complexes in Silicon'' (Mark A. Roberson and S.K 
Estreicher, Physical Review B, 49, p5128, 1994).

``Relative Stability of HT vs. H* and HT2 vs. H*2 in c-C, SiGe, and 
alpha-Sn and their consequences.'' (Dj. M. Maric, Mark A. Roberson and 
S.K. Estreicher, Materials Science Forum Vols. 143-147, 1994, pp1245-1250). 

``Vacancies And V,Hn Complexes In Si: Stable Structures, Relative Stability, 
And Diffusion Properties'' (Mark A. Roberson, S.K. Estreicher, L. Korpas, and 
J.W. Corbett, Materials Science Forum Vols. 143-147, 1994, pp1227-1232).

``Interstitial Oxygen in Elemental and Compound Semiconductors: Fundamental 
Properties and Trends'' (S.K. Estreicher, Mark A. Roberson, and C.H. Chu, 
Journal of Physics: Condensed Matter, 5, 1993, pp8943-8954).

``Interstitial Impurities in Wurtzite vs. Zincblende Semiconductors: The 
Case of Hydrogen in SiC'' (Mark A. Roberson and S.K. Estreicher, Materials 
Research Society Symposium Proceedings, 1991, Vol. 242, p.355-360).

``Vacancy-Defect Interactions in c-Si'' (S.K. Estreicher, Y. Park, Mark A. 
Roberson, to be published).

``Interstitial H in Cubic and Hexagonal SiC'' (Mark A. Roberson and S.K 
Estreicher, Physical Review B 44, p.10578-10584, 1991).

``Potential Energy Surfaces and Stability of Oxygen in Elemental and 
Compound Semiconductors'' (S.K. Estreicher, Mark A. Roberson,  C.H. Chu, 
and J. Solinsky, Materials Research Symposium Proceedings, 1991, Vol. 242, 
p.361-366).

 ABSTRACTS AND PRESENTATIONS 

 Ph.D. Dissertation: 
``Light Interstitials and Their Interactions in Semiconductors" (Texas Tech 
University, December 1993).

Master's Thesis:
``Infrared Optical Constants of Aqueous Solutions of K2HPO4 and KH2PO4" 
(Stephen F. Austin State University, December 1989).

``Muon Charge States in GaAs.'' (R.L. Lichti, T.R. Adams, M. Roberson, T.L. 
Estle, B. Hitti, K.H. Chow, R.F. Kiefl, S.F.J. Cox, C.S. Schwab, E.A. Davis, 
D.W. Cooke, A. Morrobell-Sera) June 1994, Meeting of the Royal Society on 
Physics and Chemistry of Hydrogen in Materials: Modeling by Muon 
Implantation.

``Vacancy and vacancy-H interactions in c-Si'' Spring, 1993, Poster 
Presentation (Texas Tech University).

``Di-Hydrogen Complexes in Crystalline Silicon'' (Mark A. Roberson and S.K. 
Estreicher). Fall 1992, Texas Section meeting of American Physical Society, 
(Rice University).

``Barrier for Migration of Interstitial Oxygen in Elemental and Compound 
Semiconductors'' (Mark A. Roberson and S.K. Estreicher). Fall 1992, Texas 
Section meeting of American Physical Society (Rice University).

``Interstitial Hydrogen in Zincblende and Wurtzite SiC'' (Mark A. Roberson 
and S.K. Estreicher). March 1991, Texas Section meeting of American Physical 
Society.

``Infra-red Optical Constants of Aqueous Solutions of K2HPO4 and KH2PO4'' 
(Mark A. Roberson and Harry D. Downing). Fall 1989, Texas Section meeting of 
American Physical Society (Trinity University, San Antonio).

• American Association for the Advancement of Science
• The New York Academy of Sciences
• Sigma Pi Sigma Honor Society
• American Physical Society
• American Association of Physics Teachers

• Recipient of Graduate Student of Year Award, Texas Tech University (1993).
• Who's Who in Science and Engineering
• Who's Who in the South and Southwest
• Who's Who in America
• Recipient of Bucy Fellowship in Applied Physics
• Recipient of Robert A. Welch Research Fellowship

Mark Roberson was born in Lufkin, Texas, where he received an Associate of Applied Science in Engineering degree in 1982 from Angelina Junior College. From 1982 to 1985, he was at College Station where he received a Bachelor of Science in Electrical Engineering from Texas A&M University. In 1989, a Master's of Science in Physics from Stephen F. Austin State University followed. In December, 1993, Mark Roberson received the Doctor of Philosophy in Theoretical Physics at Texas Tech University. He was employed as a post-doc at Texas Tech from then until June of 1995. Since then he has been teaching classes at Vernon College.

Bibliophile, catapult design, home brewing of adult beverages, learning.

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