First observation of the OIO molecule by time-resolved flash photolysis absorption spectroscopy

✍ Scribed by Stefan Himmelmann; Johannes Orphal; Heinrich Bovensmann; Andreas Richter; Annette Ladstätter-Weissenmayer; John P. Burrows

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 362 KB
• Volume: 251
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(96)00114-5

✦ Synopsis

In the time-resolved flash photolysis of 12 in 03, in addition to the IO electronic bands between 21500 and 26000 cm-1, a new absorption spectrum has been observed between 15000 and 21500 cm-1, which is attributed to the .~-X electronic bands of the OIO radical. A number of spectroscopic constants of the .~ state of OIO were determined by linear least-squares fitting the observed spectrum: v 1 (symmetric I-O stretch) oJ l = 631 cm-1, v~ anharmonicity constant ¢o I x I -2.6 cm-l, v 2 (O-I-O angle bend) w 2 = 177 cm -I, electronic energy with respect to the ground state T e -14553 cm-1. These values are in good agreement with those expected from measurements of the same electronic bands in OCIO and OBrO.