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

✍ Scribed by Marcus Mendenhall; Alan Barnes; Patrick Bunton; Richard Haglund; Larry Hudson; Richard Rosenberg; Dwight Russell; Johannes Sarnthein; Phillip Savundararaj; Norman Tolk; Joel Tellinghuisen

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 598 KB
• Volume: 147
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(88)80224-0

✦ Synopsis

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 "CN-as well as normal "CN-. Analysis ofthe spectrum yields ground state vibrational constants we=2125 cm-' and w,&= 14.2 cm-' for "CN-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 KC1 samples. This value is consistent with expectations for the forbidden triplet-singlet transition, but inconsistent with other studies of this system.