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Rate coefficients at 300 K for the vibrational energy transfer reactions from N2(v=1) to O+ 2(v=0) and NO+(v=0) J. Chem. Phys. 80, 6095 (1984); 10.1063/1.446709Vibrational energy transfer in CO2-C2H2n+2 (n=0,1,2) mixtures from 220 to 300 K J. Chem. Phys. 78, 5971 (1983); 10.1063/1.444612Vibrational relaxation of NO X 2Π(v = 1) in the temperature range 100-300 °K The V -V energy transfer rate constants are reported for the deactivation of both CO(v = 11 and N 2(v = 11 by O 2 and CH. in the temperature range 300 to 80 K. The results are obtained by an infrared fluorescence technique. In order to study the relaxation of N 2 (v = II. a small amount of CO is added to the gas mixture to function both as a pump and a probe. The probability vs temperature curves obtained are approximately parallel for the deactivation of CO(v = 11 as compared to that of N 2 {v = 11-This temperature dependence is found to resemble that for the V -T deactivation of CO at low temperatures. This is due to the large mismatch for these V-V energy transfer processes. The rate constants at liquid N2 temperatures are compared with rate constants measured by other researchers for relaxation of the same systems in the liquid phase. The results show that the relaxation rate constants. expressed in terms of cm 3 S-I molecule-I. are approximately equal in the two phases. The implications of this result with respect to the cell and statistical models of vibrational relaxation in liquids is discussed.