Propensity rules for excitation of atoms in high-lying doubly excited states by charged-particle impact

Journal Article · Sat Dec 01 00:00:00 EST 1990 · Physical Review, A; (USA)

DOI:https://doi.org/10.1103/PhysRevA.42.6391· OSTI ID:6256311

Atsumi, T; Ishihara, T ^[1]; Koyama, N ^[2]; Matsuzawa, M ^[3]

---

1. Department of Applied Physics and Chemistry, The University of Electro-Communications, Chofu-shi, Tokyo (Japan)
2. Division of Affairs of Foreign Students, The University of Electro-Communications, Chofu-shi, Tokyo (Japan)
3. Department of Applied Physics and Chemistry, The University of Electro-Communications, Chofu-shi, Tokyo (Japan) Institute for Molecular Science, Myodaiji, Okazaki (Japan)

For the {sup 1}{ital P}{sup {ital o}}-{sup 1}{ital S}{sup {ital e}}, {sup 1}{ital P}{sup {ital o}}-{sup 1}{ital D}{sup {ital e}}, {sup 1}{ital D}{sup {ital e}}-{sup 1}{ital S}{sup {ital e}}, and {sup 1}{ital D}{sup {ital e}}-{sup 1}{ital P}{sup {ital o}} double-electron excitation processes of He in high-lying doubly excited states by charged-particle impact, we have evaluated the Born cross sections using the hyperspherical wave functions. Together with our previous results (Motoyama, Koyoma, and Matsuzawa, Phys. Rev. A 38, 670 (1988); Matsuzawa, Atsumi, and Koyama, {ital ibid}. 41, 3596 (1990)), we have theoretically found a set of propensity rules for these excitation processes between the doubly excited states with {ital L}{le}2. These rules indicate that a He atom in a strongly correlated doubly excited state tends to conserve its internal state as a flexible {ital e}-He{sup 2+}-{ital e} linear triatomic molecule during the excitation processes except for the restriction arising from the Pauli exclusion principle. How the exclusion principle modifies the above-mentioned propensity rules for singlet-singlet optically allowed excitation processes depends on the radial correlation of the initial state. The behaviors of the doubly excited atoms in rotationally and/or vibrationally excited states as the flexible linear triatomic molecule tend to deviate from those predicted by the propensity rules so obtained. This is due to the fact that there are no final states available for the propensity rules to specify because of the restriction arising from the cutoff of the quantum numbers.

• OSTI ID: 6256311
• Journal Information: Physical Review, A; (USA), Vol. 42:11; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
HELIUM
ELECTRON-ATOM COLLISIONS
BORN APPROXIMATION
CROSS SECTIONS
EXCITATION
PROBABILISTIC ESTIMATION
TWO-BODY PROBLEM
ATOM COLLISIONS
COLLISIONS
ELECTRON COLLISIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
FLUIDS
GASES
MANY-BODY PROBLEM
NONMETALS
RARE GASES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena