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Effect of the Potential Energy Surface on Ultracold Molecule-Molecule Collisions

Jesús Pérez‐Ríos, José Campos-Martı́nez, Marta I. Hernández

Sep 5, 20100 citations

Ultracold collisions between atoms and molecules in high vibrational states: effect of the atom-atom scattering length

Goulven Quéméner, Pascal Honvault, Jean–Michel Launay

Bulletin of the American Physical SocietyMay 30, 20080 citations

Hyperfine-to-rotational energy transfer in ultracold atom–molecule collisions of Rb and KRb

Yi-Xiang Liu, Lingbang Zhu, Jeshurun Luke +7 more

arXiv:2407.08891Nature ChemistryApr 7, 202521 citations

Vibrational energy transfer in ultracold molecule-molecule collisions

Goulven Quéméner, N. Balakrishnan, Roman V. Krems

We present a rigorous study of vibrational relaxation in $\text{para}\text{\ensuremath{-}}{\mathrm{H}}_{2}+\text{para}\text{\ensuremath{-}}{\mathrm{H}}_{2}$ collisions at cold and ultracold temperatures and identify an efficient mechanism of rovibrational energy transfer. If the colliding molecules are in different rotational and vibrational levels, the internal energy may be transferred between the molecules through an extremely state-selective process involving simultaneous conservation of internal energy and total rotational angular momentum. The same transition in collisions of distinguishable molecules corresponds to the rotational energy transfer from one vibrational state of the colliding molecules to another.We present a rigorous study of vibrational relaxation in $\text{para}\text{\ensuremath{-}}{\mathrm{H}}_{2}+\text{para}\text{\ensuremath{-}}{\mathrm{H}}_{2}$ collisions at cold and ultracold temperatures and identify an efficient mechanism of rovibrational energy transfer. If the colliding molecules are in different rotational and vibrational levels, the internal energy may be transferred between the molecules through an extremely state-selective process involving simultaneous conservation of internal energy and total rotational angular momentum. The same transition in collisions of distinguishable molecules corresponds to the rotational energy transfer from one vibrational state of the colliding molecules to another.

arXiv:0709.3081Physical Review AMar 28, 200859 citations

Collisions of ultracold molecules

Hanns-Christoph Naegerl

Bulletin of the American Physical SocietyMar 10, 20080 citations

Electronic and rotational energy transfer in F(2P1/2)+H2 collisions at ultracold temperatures

Roman V. Krems, A. Dalgarno

The dynamics of F(2P1/2)+H2 scattering at ultracold temperatures is studied. It is shown that both the rotational and vibrational excitation of H2 molecules decrease substantially the efficiency of spin–orbit relaxation in F+H2 collisions. It is observed that the near-resonant electronic transition leading to rotational excitation of H2(j=0) is of the same magnitude at high energies as the off-resonant transition in which the rotational angular momentum of H2 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(2P1/2) atoms at ultracold temperatures. It is found that rotational relaxation of excited H2 molecules is significantly enhanced by electronic transitions in F atoms and the electronic relaxation in F(2P1/2)+H2(j>0) collisions is suppressed by rotational relaxation of H2.The dynamics of F(2P1/2)+H2 scattering at ultracold temperatures is studied. It is shown that both the rotational and vibrational excitation of H2 molecules decrease substantially the efficiency of spin–orbit relaxation in F+H2 collisions. It is observed that the near-resonant electronic transition leading to rotational excitation of H2(j=0) is of the same magnitude at high energies as the off-resonant transition in which the rotational angular momentum of H2 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(2P1/2) atoms at ultracold temperatures. It is found that rotational relaxation of excited H2 molecules is significantly enhanced by electronic transitions in F atoms and the electronic relaxation in F(2P1/2)+H2(j>0) collisions is suppressed by rotational relaxation of H2.

The Journal of Chemical PhysicsJul 1, 200223 citations

Vibrational energy transfer in ultracold molecule-molecule collisions

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