Quenching and vibrational relaxation of SO(B3Sigma-, v' <or= 3) by collisions with Ar and N2.
Fluorescence from a single vibronic level of SO(B3Sigma-, v' <or= 3) prepared by a pulse excitation has been detected and thorough kinetic analyses for the photochemical processes have been made. Deconvolution analysis by the integrated-profiles method of the time-resolved fluorescence profiles recorded at various buffer gas (Ar and N2) pressures has given the deactivation rates of initially prepared vibrational levels. Componential analysis of the dispersed fluorescence measured at different buffer gas pressures has provided the rate coefficients for level-to-level vibrational relaxation. It has been found that not only the single-quantum relaxation (Deltav = 1) but also the multiquantum relaxation (Deltav = 2 and 3) occurs by collisions with Ar and N2. The efficiency of quenching is strongly dependent on the vibrational levels and correlates with the energies of the lowest nonfluorescent rotational levels. Candidates for the electronic states governing the quenching process have been discussed based on the kinetic and spectroscopic data.
Hatano
Takayuki
T
Department of Chemistry, Niigata University, Ikarashi, Niigata 950-2181, Japan.
Watanabe
Shinji
S
Fujii
Hidekazu
H
Tokue
Ikuo
I
Yamasaki
Katsuyoshi
K