| Abstract: | By means of the technique of laser-induced fluorescence, the room-temperature vibrational relaxation of DF(v = 1) has been studied in the presence of several polyatomic chaperones. The rate coefficients obtained in units of (μ;sec·torr)?1] are CH4, 0.22; C2H6, 0.61; C4H10, 1.26; C2H2, 4.0 × 10?2; C2H2F2, 1.86 × 10?2; C2H4, 0.175; CH3F, 0.36; CF3H, 1.95 × 10?2; CF4, 1.0 × 10?3; CBrF3, 5.6 × 10?4; NF3, 5.1 × 10?4; SO2, 1.27 × 10?2; and BF3, 7.1 × 10?3. Results are also reported for vibrational relaxation rate coefficients for HF(v = 1) in the presence of the following chaperones: CH4, 2.6 × 10?2; C2H6, 5.9 × 10?2; C3H8, 8.4 × 10?2; and C4H10, 0.128. A comparison of DF and HF results indicates that for deactivation by CnHn+2, rate coefficients for DF are approximately an order of magnitude larger than for HF. The deactivation rate coefficient of DF(v = 1) by CH4 was found to decrease with increasing temperature between 300 and 740°K. |
