Photodissociation of positive ions. I. Photodissociation spectra of D/sup +//sub 2/, HD/sup +/, and N/sub 2/O/sup +/
The operation of an apparatus constructed to measure absolute photodissociation spectra of ions and to determine the kinetic energy spectrum of the photoproducts by time-of-flight analysis is described. Photodissociation spectra for the processes D/sup +//sub 2/+h..nu -->..D/sup +/+D and N/sub 2/O/sup +/..-->..NO/sup +/+N have been obtained, and the photodissociation cross sections for HD/sup +/+h..nu -->..H/sup +/+D and HD/sup +/+h..nu -->..D/sup +/+H have been measured. The photodissociation spectrum of D/sup +//sub 2/, using an irradiation bandwidth of <0.05 to 0.1 nm, is in reasonable agreement with the structureless spectrum of von Busch and Dunn obtained with a 20 nm bandwidth. The two possible photoprocesses in HD/sup +/ were observed to have the same cross sections 2 x 10/sup -19/ cm/sup 2/ at 589 nm. The photodissociation spectrum of N/sub 2/O/sup +/ over the range 295--342 nm was found to be very sharply structured, with sigma/sub NO/+ =2.6 x 10/sup -18/ cm/sup 2/ for the largest peak, at 338.5 nm. Fifteen peaks in the N/sub 2/O/sup +/ spectrum were assigned to vibrational progressions in the A /sup 2/..sigma..reverse arrowX /sup 2/Pisub /sub 1///sub 2/, /sub 3///sub 2/ transition. In making the assignments it was necessary to assume the ions possess from 0 to 2 quanta in the degenerate bending mode, leading to Renner effect splitting in the /sup 2/PI state.
- Research Organization:
- Air Force Geophysics Laboratory (LKB), Hanscom AFB, Bedford, Massachusetts 01731
- OSTI ID:
- 7319355
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 67:2; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
CHEMISTRY
DEUTERIDES
DEUTERIUM COMPOUNDS
DEUTERIUM IONS
DISSOCIATION
ENERGY
ENERGY SPECTRA
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
IONS
KINETIC ENERGY
KINETICS
MOLECULAR IONS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMISTRY
REACTION KINETICS
SPECTRA