Two-color vibrationally mediated photodissociation of nitric acid
Two-color vibrationally mediated photodissociation, in which one photon excites an overtone vibration and a second photon of a different wavelength dissociates the highly vibrationally excited molecule prepared by the first photon, is a means of investigating the role of vibrational excitation in photodissociation and of obtaining vibrational overtone excitation spectra. Application of this scheme to nitric acid (HONO/sub 2/) involves exciting the third OH stretching overtone vibration (4v/sub OH/), photodissociating the vibrationally excited molecule with 355-nm light, and detecting the OH fragment using laser-induced fluorescence. These measurements show that most of the OH products are vibrationally unexcited and that about a quarter of the available energy goes into relative translation. The vibrational overtone excitation spectrum has congested P-, Q-, and R-branch rotational structure that forms a 50-cm/sup -1/-wide band.
- Research Organization:
- Univ. of Wisconsin, Madison
- OSTI ID:
- 6085543
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:18; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400500* -- Photochemistry
CHEMICAL REACTIONS
CHEMISTRY
DATA
DISSOCIATION
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FLUORESCENCE
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
LASERS
LUMINESCENCE
MULTI-PHOTON PROCESSES
NITRIC ACID
NUMERICAL DATA
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
VIBRATIONAL STATES