ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Absorption spectra for 16O3 and 18O3 near 1 μ have been recorded to explore the rotational structure associated with the 3A2 and 3B2 electronic states of ozone. Rotational features within the 3A2←1A1 1-0 band respond predictably to isotopic substitution, enabling determination of the upper state adiabatic electronic energy and asymmetric stretching frequency via isotope shift techniques. We find an adiabatic energy of 9963±4 cm−1, in excellent agreement with that determined earlier from vibronic isotope shifts observed at lower resolution, 9990±70 cm−1. We also find an asymmetric stretching frequency of 367±17 cm−1, indicating that the 3A2 state potential energy surface is bound against dissociation to O+O2 despite the fact that it lies above the corresponding dissociation limit. Rotational structure associated with transitions to the 3B2 state is detected for the first time. It responds anomalously to 18O substitution. The geometry of the upper state for 18O3 appears to differ markedly from that for 16O3 (Δθ(approximate)−4 deg, or Δre(approximate)+0.07A), suggesting that the 3B2 surface is strongly anharmonic and precluding a straightforward analysis of the isotope shifts. © 1998 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.475933
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