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State-selected study of ion-molecule reactions using tandem molecular beam photoionization mass spectrometry. II. Absolute spin-orbit-state excitation cross sections for the reactions Ar/sup +/(/sup 2/P/sub 3/2/) + Ar(/sup 1/S/sub 0/) and Ar/sup +/(/sup 2/P/sub 3/2/) + N/sub 2/(X,v = 0)

Thesis/Dissertation ·
OSTI ID:6214666
A new ion-molecule reaction apparatus, which consists of a photoionization source, a tandem mass spectrometer, and a radio frequency (rf) octopole reaction cell, is described. Using a quadrupole mass filter to reject H/sub 3//sup +/ background ions formed at the photoionization region, absolute total cross sections for the reaction H/sub 2//sup +/(nu/sub 0/') + H/sub 2/(nu/sub 0/'' = 0) ..-->.. H/sub 3//sup +/ + H, were measured as a function of the vibrational state of reactant H/sub 2//sup +/, where nu/sub 0/' = 0-4, over the center-of-mass collision energy range of 0.04-15eV. Absolute spin-orbit-state-selected total cross sections for charge transfer reactions Ar/sup +/(/sup 2/P/sub 3/2/) + N/sub 2/X, v = 0) and Ar/sup +/(/sup 2/P/sub 1/2/) + N/sub 2/ X, v = 0), sigma/sub 3/2/ and sigma/sub 1/2/, respectively, at the E/sub c.m./ range of 0.25-115.3 eV were also measured using the same apparatus. With the triple-quadrupole double-octopole photoionization tandem mass spectrometer, absolute state-selected total cross sections, sigma/sub v'/,v' = 0 and 1, for reaction N/sub 2//sup +/(X, v' = 0,1) + Ar(/sup 1/S/sub 0/) ..-->.. N/sub 2/(X,v) + Ar/sup +/(/sup 2/P/sub 3/2,1/2/) (reaction (1)) over E/sub c.m./ range of 1.2-140 eV were measured.
Research Organization:
Iowa State Univ. of Science and Technology, Ames (USA)
DOE Contract Number:
W-7405-ENG-82
OSTI ID:
6214666
Country of Publication:
United States
Language:
English