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Ultraviolet spectroscopy of CN−in alkali halides: Dynamics of the metastable triplet state

Authors
Journal
Chemical Physics Letters
0009-2614
Publisher
Elsevier
Publication Date
Volume
147
Issue
1
Identifiers
DOI: 10.1016/0009-2614(88)80224-0
Disciplines
  • Physics

Abstract

Abstract An ultraviolet emission spectrum attributed to cyanide ions in alkali halide lattices is excited by VUV irradiation and electron impact, using samples containing isotopically substituted 13CN − as well as normal 12CN −. Analysis of the spectrum yields ground state vibrational constants ω e= 2125 cm −1 and ω eχ e = 14.2 cm −1 for 12CN − in KCl. The excited electronic state lies 5.6 eV above the ground state and has room-temperature decay lifetime of 80 ms in very dilutely doped KCl samples. This value is consistent with expectations for the forbidden triplet-singlet transition, but inconsistent with other studies of this system.

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