Rotational energy transfer in HF

A rotational nonequilibrium model has been developed to simulate the infrared double‐resonance experimental technique designed to study rotational relaxation of HF gas in the v=1 and higher vibrational states. State‐to‐state rate coefficients for this rotation‐to‐translation relaxation model have been obtained from a surprisal analysis and are found to scale as an inverse power of the rotational energy transferred. Phenomenological rates for the rotational energy transfer in the v=1 state for J=0 to J=7 with Δ J =+1, +2, +3, and +4 are found to be in excellent agreement with the reported phenomenological rates from available experiments for both the v=1 and v=2 states. It appears, therefore, that the state‐to‐state rate coefficients for rotational relaxation of HF are insensitive to the v state. Angular momentum statistics corresponding to conservation of mj are found to give better fits to the data than those with mj assumed to be completely randomized.

[1]  H. Rabitz,et al.  Rotational relaxation rates in HF and Ar–HF from the direct inversion of pressure broadened linewidths , 1981 .

[2]  R. Copeland,et al.  Laser double resonance measurements of rotational energy transfer rates in HF(η = 2) , 1981 .

[3]  R. Wilkins,et al.  Temperature dependence of vibrational relaxation from the upper vibrational levels of HF and DF , 1980 .

[4]  M. Keil,et al.  Energy transfer as a function of collision energy. III. State-to-state cross sections for rotational-to-translational energy transfer in HF+Ar , 1980 .

[5]  D. Pritchard,et al.  Power law scaling of rotational energy transfer in Na*2(AΣ)+He, H2, CH4, and N2 , 1979 .

[6]  D. Pritchard,et al.  Rotational energy transfer in Na*2–Xe collisions: Level to level dynamics , 1979 .

[7]  D. Pritchard,et al.  Power law scaling for rotational energy transfer , 1979 .

[8]  R. Wilkins,et al.  Temperature dependence of HF(v1=1)+HF(v2=0) vibrational relaxation , 1979 .

[9]  R. Wilkins.  Mechanisms of energy transfer in hydrogen fluoride systems , 1977 .

[10]  L. Sentman.  Rotational relaxation of HF , 1977 .

[11]  R. T. Pack,et al.  Classical trajectory studies of rotational transitions in Ar–CO2 collisions , 1977 .

[12]  R. H. Hobbs,et al.  Rotational relaxation studies of HF using ir double resonance , 1976 .

[13]  D. Kouri,et al.  On combined statistical and jz‐conserving coupled states approximations , 1976 .

[14]  R. Levine,et al.  The role of the collision partner in the rotational excitation of diatomic molecules , 1976 .

[15]  J. Hinchen.  Rotational population transfer in hf , 1975 .

[16]  R. Levine,et al.  Vibrational energy transfer in molecular collisions: An information theoretic analysis and synthesis , 1975 .

[17]  R. T. Pack.  Close coupling test of classical and semiclassical cross sections for rotationally inelastic Ar-N2 collisions , 1975 .

[18]  L. M. Peterson,et al.  Rotational relaxation measurements of laser‐excited hydrogen fluoride , 1974 .

[19]  D. Kouri,et al.  Quantum mechanical close coupling approach to molecular collisions. jz ‐conserving coupled states approximation , 1974 .

[20]  H. Rabitz.  Effective Potentials in Molecular Collisions , 1972 .

[21]  John C. Polanyi,et al.  Mechanism of Rotational Relaxation , 1972 .