O 1D quantum yields from O3 photolysis in the near UV region between 305 and 375 nm

Literature Information

Publication Date 2000-03-10
DOI 10.1039/B000159G
Impact Factor 3.676
Authors

Dieter Bauer, Luca D'Ottone, Anthony J. Hynes


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Abstract

The formation of O 1D from the photolysis of ozone has been observed at photolysis wavelengths between 305 and 375 nm and relative quantum yields for O 1D production have been determined. Ozone was photolyzed using a frequency doubled, optical parametric oscillator. O 1D was monitored indirectly, using laser induced fluorescence (LIF) detection of vibrationally excited OH as a ‘‘spectroscopic marker’’. Relative O 1D yields were measured from 305 to 375 nm at 295 K and from 305 to 340 nm at 273 K. The quantum yield decreases between 305 and 325 nm with a temperature dependence in the range between 310 and 325 nm. This is consistent with O 1D production via both spin-allowed and spin-forbidden processes. Between 325 and 375 nm a constant quantum yield of 0.064±0.006 was obtained suggesting production via an exclusively spin-forbidden process and indicating that absorption takes place to a single excited state which either predissociates, yielding O3P and O23Σ−, or crosses to another surface before dissociating to produce O 1D and O23Σ−.

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Physical Chemistry Chemical Physics
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