Se. Bell et al., ATMOSPHERIC-PRESSURE CHEMICAL-IONIZATION OF ALKANES, ALKENES, AND CYCLOALKANES, Journal of the American Society for Mass Spectrometry, 5(3), 1994, pp. 177-185
Normal and cyclic alkanes and alkenes form stable gas-phase ions in ai
r at atmospheric pressure from 40 to 200-degrees-C when moisture is be
low 1 ppm. Ionization of alkanes in a Ni-63 source favored charge tran
sfer over proton transfer through pathways involving [M - 1]+ and [M -
3]+ ions. Ion mobility spectra for alkanes showed sharp and symmetric
al profiles while spectra for alkenes suggested fragmentation. Ion ide
ntifications were made by using mass spectrometry, and ionization path
ways were supported by using deuterated analogs of alkanes and alkenes
. Alkanes were ionized seemingly through a hydrogen abstraction pathwa
y and did not proceed through an alkene intermediate. New methods for
interpretation of mobility spectra utilizing ion mobility spectrometry
, atmospheric pressure chemical ionization mass spectrometry, chemical
ionization mass spectrometry, and ion mobility spectrometry-mass spec
trometry data were demonstrated.