By using mol. beam apparatus the visible (450-900 nm) chemiluminescence of the reaction of F with CH3F was investigated. Seven vibronic bands of HCF(?A''-X1A') and 4 vibrational bands of HF ground state overtone transitions were obtained. The relative vibrational state distributions of HF (V' = 4, 5, 6) states and the rotational temperature of HF (V' = 3) state were obtained. The analyses show that the 2 kinds of spectra were caused by the secondary reaction F with CH2F. This reaction causes the statistical distribution of HF high vibrational levels and the Boltzmann distribution of the HF rotational levels.

Key words: METHANE P, FLUORINE, CARBENE, EXCITED STATE, STATISTICAL DISTRIBUTION, FLUOROHYDROCARBON, ENERGY TRANSFER, CHEMILUMINESCENCE REACTION, ELECTRON TRANSITION, ELECTRON COLLISIONS