We have calculated the isotropic C6 coefficients characterizing the long-range van der Waals interaction between two identical heteronuclear alkali-metal diatomic molecules in the same arbitrary vibrational level of their ground electronic state X1Σ+. We consider the ten species made up of 7Li, 23Na, 39K, 87Rb, and 133Cs. Following our previous work [Lepers et al., Phys. Rev. A 88, 032709 (2013)], we use the sum-over-state formula inherent to the second-order perturbation theory, composed of the contributions from the transitions within the ground state levels, from the transition between ground-state and excited state levels, and from a crossed term. These calculations involve a combination of experimental and quantum-chemical data for potential energy curves and transition dipole moments. We also investigate the case where the two molecules are in different vibrational levels and we show that the Moelwyn-Hughes approximation is valid provided that it is applied for each of the three contributions to the sum-over-state formula. Our results are particularly relevant in the context of inelastic and reactive collisions between ultracold bialkali molecules in deeply bound or in Feshbach levels.
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7 June 2015
Research Article|
June 02 2015
Long-range interactions between polar bialkali ground-state molecules in arbitrary vibrational levels
R. Vexiau;
R. Vexiau
Laboratoire Aimé Cotton, CNRS/Université Paris-Sud/ENS-Cachan
, Bât. 505, Campus d’Orsay, 91405 Orsay, France
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M. Lepers;
M. Lepers
a)
Laboratoire Aimé Cotton, CNRS/Université Paris-Sud/ENS-Cachan
, Bât. 505, Campus d’Orsay, 91405 Orsay, France
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M. Aymar;
M. Aymar
Laboratoire Aimé Cotton, CNRS/Université Paris-Sud/ENS-Cachan
, Bât. 505, Campus d’Orsay, 91405 Orsay, France
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N. Bouloufa-Maafa;
N. Bouloufa-Maafa
Laboratoire Aimé Cotton, CNRS/Université Paris-Sud/ENS-Cachan
, Bât. 505, Campus d’Orsay, 91405 Orsay, France
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O. Dulieu
O. Dulieu
Laboratoire Aimé Cotton, CNRS/Université Paris-Sud/ENS-Cachan
, Bât. 505, Campus d’Orsay, 91405 Orsay, France
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a)
Electronic mail: maxence.lepers@u-psud.fr
J. Chem. Phys. 142, 214303 (2015)
Article history
Received:
March 09 2015
Accepted:
May 13 2015
Citation
R. Vexiau, M. Lepers, M. Aymar, N. Bouloufa-Maafa, O. Dulieu; Long-range interactions between polar bialkali ground-state molecules in arbitrary vibrational levels. J. Chem. Phys. 7 June 2015; 142 (21): 214303. https://doi.org/10.1063/1.4921622
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