학술논문

Investigation of invisible oscillation on the photodetachment cross-section of H $_{2}^{-}$ near a hard surface.
Document Type
Article
Source
Pramana: Journal of Physics. Jul2013, Vol. 81 Issue 1, p117-126. 10p.
Subject
*SURFACES (Physics)
*PHOTODETACHMENT
*NUCLEAR cross sections
*ELECTRON spectroscopy
*OSCILLATIONS
*IMAGING systems
*HARDNESS
Language
ISSN
0304-4289
Abstract
Induced effects in the photodetached electron spectra from a diatomic negative ion (H $_2^-$) near a hard surface are investigated. A z-polarized laser is used to knock off electrons from H $_2^-$ in the vicinity of a hard surface. Theoretical imaging method is used to derive a generalized modulation function for the total photodetachment cross-section, which describes invisible oscillation. It is found that the hard surface strongly affects the detached electron flux as well as total photodetachment cross-section. There exists strong dependence on the distance of H $_{2}^{-}$ from the hard surface and also on the separation of atomic centres of H $_2^-$. Unlike the detached electron flux, no visible oscillations are noted in the photodetachment cross-section. [ABSTRACT FROM AUTHOR]