Generalized oscillator strengths and integral cross sections for the valence-shell excitations of oxygen studied by fast electron impact

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.042716· OSTI ID:21450784

Weiqing, Xu; Jianmin, Sun; Youyan, Wang; Linfan, Zhu ^[1]

---

1. Hefei National Laboratory for Physical Sciences at Microscale, Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China)

The generalized oscillator strengths and differential cross sections for electron-impact excitation of the A{sup '} {sup 3}{Delta}{sub u}, Schumann-Runge continuum, and E {sup 3}{Sigma}{sub u}{sup -}({nu}{sup '}=0,1) states of oxygen have been determined at an incident electron energy of 2.5 keV. Good agreement is found between the present generalized oscillator strengths of the Schumann-Runge continuum and E {sup 3}{Sigma}{sub u}{sup -}({nu}{sup '}=1) states and the previous ones measured at higher impact energies, which indicates that the first Born approximation is satisfied at an impact energy of 400 eV. However, the large difference between the present generalized oscillator strengths of the A{sup '3}{Delta}{sub u} and E {sup 3}{Sigma}{sub u}{sup -}({nu}{sup '}=0) states and the previous ones is observed, and the possible reasons are discussed. The BE-scaled (binding energy B and excitation energy E) or BEf-scaled (B, E, and f values) integral cross sections for the A{sup '3}{Delta}{sub u}, Schumann-Runge continuum, and E {sup 3}{Sigma}{sub u}{sup -}({nu}{sup '}=0,1) states from its threshold to 5 keV were calculated based on the present generalized oscillator strengths. The present scaled integral cross sections are in good agreement with the previous ones measured at the moderate impact energies except for that of the A{sup '3}{Delta}{sub u} state.

• OSTI ID: 21450784
• Journal Information: Physical Review. A, Vol. 82, Issue 4; Other Information: DOI: 10.1103/PhysRevA.82.042716; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BINDING ENERGY
BORN APPROXIMATION
DIFFERENTIAL CROSS SECTIONS
ELECTRON-ATOM COLLISIONS
ELECTRONS
EV RANGE
EXCITATION
INTEGRAL CROSS SECTIONS
KEV RANGE
OSCILLATOR STRENGTHS
OXYGEN
VALENCE
APPROXIMATIONS
ATOM COLLISIONS
CALCULATION METHODS
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
FERMIONS
LEPTONS
NONMETALS