Rotational relaxation in ultracoldCO+Hecollisions

Abstract

and ultracold collisions involving rotationally hot CO molecules are investigated using quantum mechanical ¥ coupled channel, coupled states, and effective potential scattering formulations. Quenching rate coefficients ¦ are given for initial rotational levels near the dissociation threshold. The stability of the CO "super rotors" § against collisional decay is compared to previous investigations involving homonuclear molecules. It is found that quasiresonant transitions provide a significantly stronger contribution to the total relaxation rate than in the comparable case of O 2. © As in the case of H 2 , sharp structures in the distribution of total quenching rate coefficients ¥ are found at rotational levels where quasiresonant scattering is not allowed.

Molecules near absolute zero and external field control of atomic and molecular dynamics

“…0 K. Following the analysis of Landau and Lifshitz [10] and Mott and Massey [11], Balakrishnan et al [12] and Bohn and Julienne [13] showed that it is most convenient to express the zero temperature reaction rate in terms of the imaginary part of the scattering length related to off-diagonal elements of the scattering S-matrix. Several recent calculations of ro-vibrational relaxation in atom-molecule collisions [14][15][16][17][18][19][20][21][22][23], non-adiabatic electronic relaxation in atom-atom and atom-molecule collisions [24][25][26][27] and reactive scattering [28][29][30][31][32][33][34][35] showed that rate constants for inelastic energy transfer and chemical reactions have significant magnitudes at zero kelvin. In particular, Balakrishnan and Dalgarno [28] found that the chemical reaction F þ H 2 !…”

Interactions and dynamics in Li+Li2 ultracold collisions

“…Such behaviour has also been studied at ultralow temperatures. [78][79][80][81] Inelastic transitions in some highly excited rotational levels of hydrogen molecules were found to be dramatically suppressed when quasiresonant transitions were energetically forbidden. However, the highest initial rotational states considered for 7 Li 2 have n = 10, for which the rotational energy is only about half the vibrational spacing.…”

Editorial: Quo vadis, cold molecules?

“…The studies of the He + H 2 and other collision systems [116][117][118][119][120][121][122][123][124][125][126][127][128] showed that zero temperature rate coefficients for vibrational, rotational and electronic energy transfer in atom-atom and atom-molecule collisions may have substantial magnitudes. It was demonstrated by several authors that the attractive part of the interaction potential in the entrance collision channel is critical for the dynamics of ultracold scattering.…”