15min:

ANDREW J. MARR AND TREVOR J. SEARS, Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973-5000; PAUL B. DAVIES, University of Cambridge, Lensfield Road, Cambridge, United Kingdom CB2 1EW.

The infrared spectrum of the X² state of CBr from 680~-~750 cm^-1 has been measured using diode laser absorption spectroscopy. The CBr radicals were produced by 193~nm excimer photolysis of bromoform. Transitions belonging to the v~=~1~<-~0,~2~<-~1,~3~<-~2 and 4~<-~3 bands of both isotopomers, C⁷⁹Br and C⁸¹Br have been identified. Employing case (a) matrix elements, spectroscopic parameters were obtained from a least squares fit where the transition frequencies of both isotopomers were fitted simultaneously. The results were used to obtain a Rydberg-Klein-Rees (RKR) potential. Additionally, the kinetics of the CBr~+~O₂ reaction were investigated. This is the first recording of vibrational spectra of CBr.

Acknowledgements: This work was carried out at Brookhaven National Laboratory under Contract No. DE-AC02-76CH00016 with the U.S. Department of Energy and support by its Division of Chemical Sciences, Office of Basic Energy Sciences. Support was also provided by a NATO Collaborative Research Grant, No. CRG 940066.