Dr. Bogdana Bahrim

Dr. Bogdana Bahrim

General Information

  • Position: Associate Professor
  • E-mail:  bogdana.bahrim@lamar.edu 
  • Phone: 409-880-8034
  • Fax: 409-880-8245
  • Office: Archer 100-B

Education

  • Ph.D. University of Paris (Orsay)
  • MS University of Bucharest
  • BS University of Bucharest

Research Interests

  • Atomic and Surface Physics
    • Interactions of ions / atoms with surfaces
    • Theoretical and numerical methods in atomic and surface physics

When atoms are close to metal surfaces, electrons can be transferred between the atom and the solid. This charge transfer is involved in many processes like: chemisorption, desorption, fragmentation of adsorbates, chemical reactions, quenching of metastable states. The most efficient type of transfer is the resonant load transfer (RCT).

RCT is sensitive not only to the geometry of collision, but to the metal band structure as well. Band gaps, for instance, will be prohibited in the metal, thus dramatically influencing various experimental results.

When surface adsorbates are present, RCT becomes a complex three-body problem.  Adsorbates may induce: (1) non-local effects (macroscopic variation of the surface workfunction); (2) local effects due to the strong local perturbation of the space surrounding them.

The role played by surface states and image states in the electron dynamics at surfaces is essential. Adsorbates couple the surface states to the bulk states. Scattering by adsorbates may be used to laterally confine surface state electrons.

Ion/surface scattering can be considered as a special regime of channeling. Scattering in one of the possible regimes depends on the crystal and its orientation relative to the incident beam.

Areas of Teaching

  • Calculus-based University Physics I
  • Algebra-based College Physics I
  • Elementary Physics II
  • Mathematical Methods in Physics
  • Thermal Physics
  • Solid State Physics

Recent Research

Na adsorbates on Cu (111).

Studies of H channeling effects during scattering on Cu (111).

Electron dynamics during ion (atom) collisions with adsorbate covered metal surfaces.

Adsorption of atoms on surfaces, including studies of adsorption geometry, density redistribution, density of states.

Selected Publications

S. Yu, B. Bahrim, B. Makarenko, and JW Rabalais, "Dynamics conditions for channeling during H-scattering on Cu (111)" in Surface Science 614 (2013), P. 12.

S. Yu, B. Bahrim, B. Makarenko, and JW Rabalais, "Local effect of Na adsorption on Cu (111)". Surface Science 606 (2012), P. 1700.

R. Zhang, B. Makarenko, B. Bahrim, and JW Rabalais, "Application of low energy ion blocking for adsorption site determination of Na atoms on Cu (111) surface." Surface Science 604 (2010), 1230.

B. Bahrim, S. Yu, B. Makarenko, and JW Rabalais, "Electron dynamics in H- / Na / Cu (111) collisions". Surface Science 603 (2009), p. 703.

JP Zhao, DX Huang, ZY Chen, WK Chu, B. Makarenko, AJ Jacobson, B. Bahrim, and JW Rabalais, "Amorphous Ge quantum dots embedded in SiO2 formed by low energy ion implantation". Journal of Applied Physics, vol. 103 (2008), art # 124304.

R. Zhang, B. Makarenko, B. Bahrim, and JW Rabalais, "Determination of Na submonolayer adsorption on Cu (111) by low-energy ion blocking". Physical Review B 76 (2007), p. 113407.