VIBRATIONAL ENERGY TRANSFER FROM THE v=1 LEVEL OF HBr TO THE ($00^{\circ} 1$) LEVEL OF $CO_{2}$ AND $N_{2}O$, AND TO THE v=1 LEVEL OF $CO,NO,N_{2}$ AND $O_{2}$

Author Institution:Rate constants for the vibrational energy transfer process : \[ HBr(v=1) + M(v=0\ or\ 00^{\circ} 0) \leftrightarrow HBr(v=0) + M(v=1 or 00^{\circ} 1) + \Delta E \] with $\Delta E =hc \Delta v = hc(\nu_{HBr} - \nu_{M})$, have been measured as a function of the temperature (300 to 900 K) by the laser-induced fluorescence technic. For these systems , $\Delta_{U}$ spreads over a wide range of values, from about $210 cm^{-1}$ for $HBr-CO_{2}$ and $HBr-N_{2}$ and $HBr-N_{2}$ up to $1000 cm^{-1}$ for $HBr-O_{2}$. For the most resonant transfers in $HBr-CO_{2}$ and $HBr-N_{2}$, the rate decreases versus temperature. On the other hand, the rate for $HBr-CO_{2}$ is two orders of magnitude higher than the rate for $HBr-N_{2}$. Long-range multipolar forces are probably reasonable of these transfers, and a rather good agreement is obtained between experimental and calculated values for $HBr-CO_{2}$. For the less resonant transfer in $HBr-O_{2}$, the rate increases versus temperature, and short-range forces are probably dominant