Rotational quenching of dipole-dipole interaction
Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands
Accepted: 23 April 1997
Experiments based upon light-induced drift have yielded direct information on the rotational-state dependence of intermolecular interactions. Data were obtained for the change in collision rate ν upon rovibrational (J, v) excitation of HF in Ar, , HCl, and . It is found that J and v have independent influences on ν. For the dipole-dipole cases, ν decreases by up to 40% as JHF increases from 0 to 6. This is attributed to the increased averaging-out of the dipolar potential. A theoretical treatment based upon the first Born approximation yields good agreement with the HF-HCl data.
PACS: 34.20.Gj – Intermolecular and atom-molecule potentials and forces / 34.50.Ez – Rotational and vibrational energy transfer / 42.50.Vk – Mechanical effects of light on atoms, molecules, electrons, and ions
© EDP Sciences, 1997