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Molecular states formed by ion beam neutralization of [C 2 H 2 ] + and [C 2 H 3 ] + on metal targets
Author(s) -
Hudgins Douglas M.,
Raksit Asit B.,
Porter Richard F.
Publication year - 1988
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210230515
Subject(s) - excited state , fragmentation (computing) , chemistry , ion , atomic physics , ionization , electron ionization , metal , ion beam , analytical chemistry (journal) , physics , organic chemistry , computer science , operating system , chromatography
A combination of charge‐stripping and beam‐scattering techniques has been used to study the molecular states formed when a fast beam of [C 2 H 2 ] + and [C 2 H 3 ] + in several isotopic forms are neutralized by electron transfer from metal target atoms (K, Na, Mg and Zn). For [C 2 H 3 ] + the isotopic compositions and relative abundances of product states were found to be insensitive to the method of ion preparation (electron impact and chemical ionization). Ground state neutrals are formed in partial abundance when Mg or Zn is used as a target atom. With low ionization potential targets (K and Na) excitel dissociative states of C 2 H 2 and C 2 H 3 are formed as major beam constituents. For these states decomposition products have been identified and fragmentation energies measured. The excited states of C 2 H 2 and C 2 H 3 lie alout 6.8 eV and 2.9 eV, respectively, above their stable ground states. The discussion focuses on the possible identity of the excited states and their structural relations to the precursor ions.