Double differential electron emission cross sections for double excitation and single ionization of helium by fast e{sup {minus}}, H{sup +}, He{sup +} and He{sup 2+} projectiles at zero degree observation in the vicinity of the (2s{sup 2}){sup 1}S, (2pnp){sup 1}D and (2snp) {sup 1}P{sup 0} states for n {ge} 3.
- Univ. of Nevada, Reno, NV (United States); and others
The observation of double excitation of He by positively and negatively charged particles is a multielectron effect. Although multiple excitation is easier to understand than multiple ionization, only very little data is available for doubly excitation. In this work we report high resolution data for double excitation of He{sup **}, mainly (2s{sup 2}){sup 1}S and (2pnp) {sup 1}D and (2snp){sup 1}P{sup 0} states which decay predominantly by autoionization. The autoionization electrons have been detected in the direction of the incoming beam. Second order scattering amplitudes in Z{sub p}, the projectile charge are considered to be important for the (2s{sup 2}){sup 1}S and (2pnp){sup 1}D states. The resonance profiles embedded in the continuum background have been parametrized and double differential electron emission cross sections are given as a function of the velocity and projectile charge Z{sub p}.
- OSTI ID:
- 281188
- Report Number(s):
- CONF-9305421-; ISSN 0003-0503; TRN: 96:019113
- Journal Information:
- Bulletin of the American Physical Society, Vol. 38, Issue 3; Conference: 1993 American Physical Society annual meeting on atomic, molecular, and topical physics, Reno, NV (United States), 16-19 May 1993; Other Information: PBD: May 1993
- Country of Publication:
- United States
- Language:
- English
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