Angular distribution of photoelectrons emitted from noncrystalline solids

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.5478· OSTI ID:467376

Chen, Y F ^[1]

---

1. Precision Instrument Development Center, National Science Council, 20 RD Road VI, Hsinchu Science-Based Industrial Park, Taiwan, Republic of (China)

Monte Carlo simulations have been performed for studies of the influence of surface excitations on the angular distributions of photoelectron peak intensities. An extended Drude dielectric function, which allows the characteristic oscillator strength, damping constant, and critical-point energy for each subband of valence electrons, is employed to evaluate the position-dependent inelastic mean free paths of photoelectrons emitted from a solid surface. Elastic-scattering cross sections are calculated using phase-shift analysis and the finite difference method for a solid atom with the Hartree-Fock-Wigner-Seitz potential in the Dirac equation. Results of Monte Carlo simulations on the angular distribution of the four electron lines from gold, 4f{sub 7/2}, 4d{sub 5/2}, 4p{sub 3/2}, and 4s are presented. Our calculations reveal that surface effects leads to a reduction of the intensities at small detection angles and a sharp decrease at large angles since the surface excitation is most probable for glancing electrons. However, the difference between the results obtained with and without surface effects may nearly disappear for the ratio of two different photoelectron intensities at small escape angles. Nevertheless, the calculated results taking into account surface effects are in better agreement with the experimental data. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 467376
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 8 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
AMORPHOUS STATE
ANGULAR DISTRIBUTION
COMPUTERIZED SIMULATION
DIELECTRIC TENSOR
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ELECTRON COLLISIONS
ELECTRON EMISSION
ELECTRON SPECTROSCOPY
GOLD
INELASTIC SCATTERING
MEAN FREE PATH
MONTE CARLO METHOD
OSCILLATOR STRENGTHS
PHOTOEMISSION
SCATTERING