CaltechAUTHORS
  A Caltech Library Service

Spin-forbidden radiative decay of the a 4Piu state of O<sup> + </sup><sub>2</sub>

Bustamente, S. W. and Okumura, M. and Gerlich, D. and Kwok, H. S. and Carlson, L. R. and Lee, Y. T. (1987) Spin-forbidden radiative decay of the a 4Piu state of O<sup> + </sup><sub>2</sub>. Journal of Chemical Physics, 86 (2). pp. 508-515. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:BUSjcp87

[img]
Preview
PDF
See Usage Policy.

949Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:BUSjcp87

Abstract

The spin-forbidden radiative decay of a 4Piu O<sup> + </sup><sub>2</sub> has been measured in a radio frequency octopole ion trap. Photodissociation is used to probe the a 2Piu population as a function of trapping time. We have found that the a 4Piu state exhibits a multiple exponential decay, ranging from a few milliseconds to hundreds of milliseconds. The state dependence of the decay is seen in the photodissociation spectrum (b 4Sigma<sup> - </sup><sub>g</sub><--a 4Piu), which changes dramatically from 0.1 to 100 ms. The major changes in the spectrum are simulated by assuming that the F2 and F3 spin components of the a 4Piu state decay faster than the F1 and F4 components. We can account for this dependence on spin sublevel by assuming that the primary mechanism for radiative decay arises from spin-orbit coupling of the a 4Piu and A 2Piu states. Our results suggest that the a 4Piu radiative lifetime of 0.22 s measured by O'Keefe and McDonald reflects the decay of only the longest living a 4Piu sublevels.


Item Type:Article
Additional Information:Copyright © 1987 American Institute of Physics. Received 28 August 1986; accepted 3 October 1986. This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Chemical Sciences Division of the Department of Energy under Contract No. DE-AC-3-76SF00098. D.G. acknowledges financial support from the Deutsche Forschungsgemeinschaft, and M.O. acknowledges the support of a General Electric Fellowship.
Subject Keywords:FORBIDDEN TRANSITIONS, SPIN, OXYGEN IONS, MOLECULAR IONS, TRAPPING, IONOSPHERE, ELECTRONIC STRUCTURE, METASTABLE STATES, DISSOCIATION, ENERGY−LEVEL TRANSITIONS
Record Number:CaltechAUTHORS:BUSjcp87
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:BUSjcp87
Alternative URL:http://dx.doi.org/10.1063/1.452302
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11049
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:24 Jun 2008
Last Modified:26 Dec 2012 10:08

Repository Staff Only: item control page