Collisional ionization of high‐Rydberg lithium atoms in thermal‐energy encounters with rapidly rotating polar molecules

Autor:	Chester L. Shepard, Carl A. Kocher
Rok vydání:	1983
Předmět:	Chemistry General Physics and Astronomy chemistry.chemical_element Electron symbols.namesake Ionization Excited state Principal quantum number Rydberg formula symbols Lithium Physics::Atomic Physics Physical and Theoretical Chemistry Born approximation Atomic physics Electron ionization
Zdroj:	The Journal of Chemical Physics. 78:6620-6628
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.444660
Popis:	Ionization cross sections for high‐Ryberg lithium atoms in collisions with the polar molecules NH3, H2O, and H2S have been determined by analysis of time‐of‐flight distributions for a thermal beam of lithium atoms excited by pulsed electron impact. States with principal quantum numbers n in the range 20≲n≲75 are excited, with a peak in the distribution at n≂35. The cross sections are of order 10−12 cm2 for all three molecules. Theoretical calculations are also described, based on the first Born approximation, in which the outermost Rydberg electron is assumed to be essentially free. This theory, as well as the calculation of Matsuzawa, slightly underestimates the experimental results.
Databáze:	OpenAIRE
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