Electronic and rotational energy transfer in F([sup 2]P[sub 1/2])+H[sub 2] collisions at ultracold temperatures

Krems, Roman; Dalgarno, Alexander
July 2002
Journal of Chemical Physics;7/1/2002, Vol. 117 Issue 1, p118
Academic Journal
The dynamics of F(²P[sub ½)+H[sub 2] scattering at ultracold temperatures is studied. It is shown that both the rotational and vibrational excitation of H[sub 2] molecules decrease substantially the efficiency of spin-orbit relaxation in F+H[sub 2] collisions. It is observed that the near-resonant electronic transition leading to rotational excitation of H[sub 2](j=0) is of the same magnitude at high energies as the off-resonant transition in which the rotational angular momentum of H[sub 2] is preserved but becomes dominant in ultracold collisions. The zero temperature rate constant for spin-orbit relaxation of F is computed and suggestions are made as to the chemical reactivity of F(²P[sub ½) atoms at ultracold temperatures. It is found that rotational relaxation of excited H[sub 2] molecules is significantly enhanced by electronic transitions in F atoms and the electronic relaxation in F(²P[sub ½) + H[sub 2](j>0) collisions is suppressed by rotational relaxation of H[sub 2].


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