Vibrational state-selected study of the reaction H/sup +//sub 2/(v'/sub 0/)+H/sub 2/(v''/sub 0/ = 0). -->. H/sup +//sub 3/+H using the tandem photoionization mass spectrometry and radio frequency ion guide methods
A new ion--molecule rection apparatus, which consists of a photoionization source, a tandem mass spectrometer, and a radio frequency octopole reaction cell is described. Using a quadrupole mass filter to reject H/sup +//sub 3/ background ions formed at the photoionization source, absolute total cross sections for the reaction H/sup +//sub 2/ (v/sup prime//sub 0/) +H/sub 2/ (v/sup prime//sub 0/ = 0)..-->..H/sup +//sub 3/ +H, have been measured as a function of the vibrational state of reactant H/sup +//sub 2/, where v/sup prime//sub 0/ = 0--4, over the center-of-mass collision energy (E/sub c.m./) range of 0.04--15 eV. The experimental results are compared with phenomenological cross sections obtained in previous single gas cell studies, the quasiclassical trajectory calculations of Stine and Muckerman, and the recent similar calculations of Eaker and Schatz. The absolute total cross sections measured for v/sup //sub 0/ = 0 and 3 at E/sub c.m./ = 0.5, 1, 3, and 5 eV are found to be in agreement with ''trajectory surface hopping'' calculations which include nonadiabatic surface hopping throughout the reaction. (v/sup primeprime//sub 0/ = 0)
- Research Organization:
- Ames Laboratory, U. S. Department of Energy and Department of Chemistry, Iowa State University, Ames, Iowa 50011
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6082914
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 84:8; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
CATIONS
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CROSS SECTIONS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
IONS
KINETICS
MASS SPECTROSCOPY
MOLECULAR IONS
NONMETALS
REACTION KINETICS
RF SYSTEMS
SPECTROSCOPY
TOTAL CROSS SECTIONS
VIBRATIONAL STATES