In:
The Journal of Chemical Physics, AIP Publishing, Vol. 99, No. 8 ( 1993-10-15), p. 5910-5916
Abstract:
We report the observation of the A 2Πu electronically excited state of the isolated, gas phase O2− superoxide anion by photofragmentation in the range of 4.5 eV, well above the onset of the electron detachment continuum at 0.45 eV. The action spectrum of O− photoproducts displays an abrupt onset in the vicinity of the known O2− dissociation energy. Quantum yield studies indicate that the dissociative pathway is about 3% relative to the direct electron photodetachment channel. The angular distribution of the ejected O− ions reveals a primarily parallel electronic transition (β=+1.2±0.1), allowing the 2Πu identification of the excited electronic state. This state has been observed previously in fluorescence from O2− in alkali crystals at low temperature, and appears to be the same excited state invoked to account for dissociative attachment of electrons onto neutral O2..
Type of Medium:
Online Resource
ISSN:
0021-9606
,
1089-7690
Language:
English
Publisher:
AIP Publishing
Publication Date:
1993
detail.hit.zdb_id:
3113-6
detail.hit.zdb_id:
1473050-9
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