Vibrational transition probabilities have been measured for the B 2Σ+ (υ′ = 0, 1, 2, 4, 5)-X2Π(υ″=0-10) and C 2Δ(υ′ = 0, 1)-X2Π(υ″ = 0-5) band systems of the SiF radical. Individual B 2Σ+ and C 2Δ state vibrational levels were selectively populated by laser excitation of ground state SiF X 2Π prepared in a discharge-flow system. The resultant fluorescence was then dispersed and recorded. Comparison of the observed band strengths with Franck-Condon factors calculated from Rydberg-Klein-Rees potentials allowed the form of the respective electronic transition dipole moment functions to be estimated. The B-X system was found to have an electronic transition probability which did not vary significantly with internuclear separation. In contrast, the observations for the C-X system could only be reproduced by assuming a rapidly decreasing function. These conclusions are consistent with the accepted dominant electronic configurations of the states involved.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry