Photodissociation of ozone at 193 nm by high-resolution photofragment translational spectroscopy
- 15 April 1995
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 102 (15), 6067-6077
- https://doi.org/10.1063/1.469341
Abstract
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 O2 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 O2, recently suggested to play an important role in the stratospheric ozone balance. In addition, peaks corresponding to O2(a 1Δg) and O2(b 1Σg+) were observed, the latter confirming a previous report [A. A. Turnipseed et al., J. Chem. Phys. 95, 3244 (1991)]. Evidence was seen for a small contribution from the triple dissociation O3→3O(3P), 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 β parameters, in contrast to what is seen at longer wavelengths.Keywords
This publication has 36 references indexed in Scilit:
- Rotational population distributions of O2(X 3Σg−, v″=9, 12, and 15) following ozone photolysis at 248 nmThe Journal of Chemical Physics, 1993
- The photochemistry of ozone at 193 and 222 nmThe Journal of Chemical Physics, 1991
- Potential energy surfaces of ozone. IThe Journal of Chemical Physics, 1991
- Correlations without coincidence measurements: deciding between stepwise and concerted dissociation mechanisms for ABC .-+. A + B + CThe Journal of Physical Chemistry, 1990
- Quantum exact three-dimensional study of the photodissociation of the ozone moleculeThe Journal of Chemical Physics, 1990
- Recurrences in the autocorrelation function governing the ultraviolet absorption spectra of O3The Journal of Chemical Physics, 1989
- Dynamical interpretation of the Hartley-absorption oscillations inPhysical Review Letters, 1989
- A high-intensity multi-purpose piezoelectric pulsed molecular beam sourceReview of Scientific Instruments, 1989
- CARS spectroscopy of O2(1Δg) from the Hartley band photodissociation of O3: Dynamics of the dissociationThe Journal of Chemical Physics, 1987
- Photofragment spectroscopy of ozone in the uv region 270–310 nm and at 600 nmThe Journal of Chemical Physics, 1978