Photodissociation of ozone at 193 nm by high-resolution photofragment translational spectroscopy

Journal Article · Sat Apr 15 00:00:00 EDT 1995 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.469341· OSTI ID:6492192

Stranges, D; Yang, X; Chesko, J D; Suits, A G ^[1]

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1. Department of Chemistry, University of California, Berkeley and Chemical Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720-1460 (United States)

The photodissociation of ozone has been studied at 193 nm using high resolution photofragment translational spectroscopy. The results show six distinct peaks in the time-of-flight spectra for the O[sub 2] product and its momentum-matched O atom counterpart. The translational energy distributions determined from the time-of-flight spectra reveal the production of a range of electronic states of the photofragments. The product electronic states were identified based on the translational energy distributions, with the aid of state-resolved imaging experiments by Houston and co-workers. The results reveal the production of a substantial yield of highly excited triplet states of O[sub 2], recently suggested to play an important role in the stratospheric ozone balance. In addition, peaks corresponding to O[sub 2]([ital a] [sup 1][Delta][sub [ital g]]) and O[sub 2]([ital b] [sup 1][Sigma][sub [ital g]][sup +]) were observed, the latter confirming a previous report [A. A. Turnipseed [ital et] [ital al]., J. Chem. Phys. [bold 95], 3244 (1991)]. Evidence was seen for a small contribution from the triple dissociation O[sub 3][r arrow]3O([sup 3][ital P]), and insight into the dissociation dynamics for this process was inferred from the translational energy distributions. Branching fractions and angular distributions were measured for all channels. The latter were found in general to yield negative [beta] parameters, in contrast to what is seen at longer wavelengths. [copyright] [ital 1995] [ital American] [ital Institute] [ital of] [ital Physics].

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6492192
• Journal Information: Journal of Chemical Physics; (United States), Vol. 102:15; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
OZONE
PHOTOLYSIS
ENERGY SPECTRA
MASS SPECTROSCOPY
OXYGEN
RESOLUTION
STRATOSPHERE
TIME-OF-FLIGHT METHOD
TRIPLETS
ULTRAVIOLET RADIATION
YIELDS
CHEMICAL REACTIONS
DECOMPOSITION
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
ELEMENTS
MULTIPLETS
NONMETALS
PHOTOCHEMICAL REACTIONS
RADIATIONS
SPECTRA
SPECTROSCOPY
400500* - Photochemistry