Theory and practice in low-energy electron excitation of the levels of xenon

Autor:	Shinobu Nakazaki, W B Eissner, Keith A. Berrington, Y Itikawa
Rok vydání:	1997
Předmět:	Coupling Physics Scattering chemistry.chemical_element Condensed Matter Physics Atomic and Molecular Physics and Optics symbols.namesake Pauli exclusion principle Low energy Xenon chemistry Electron excitation Excited state Quantum electrodynamics Quantum mechanics symbols Ground state
Zdroj:	Journal of Physics B: Atomic, Molecular and Optical Physics. 30:L59-L66
ISSN:	1361-6455 0953-4075
DOI:	10.1088/0953-4075/30/2/005
Popis:	This letter concerns low-energy electron excitation from the ground state of xenon to the lowest four excited levels ( and ). We report here on the first results from Breit - Pauli R-matrix theory which investigates coupling to the 6 p and 5 d levels: specifically, in 5-, 15- and 22-level calculations. Differential cross sections at 15 eV are compared with other theories and with experiments. Our present 22-level R-matrix calculation represents the most elaborate on this system to date and gives reasonable agreement with experiments, though some discrepancies remain. We note that perturbative approaches such as recent distorted-wave calculations agree less well with experiments, and we conclude from this and from other evidence that such methods, as currently formulated, are not reliable for describing low-energy scattering from neutral systems. On the other hand, the R-matrix method appears to be capable of systematic improvement via the introduction of further states and pseudostates.
Databáze:	OpenAIRE
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