Stark effect measurements on the NaK molecule
Institut für Quantenoptik, Leibniz Universität
2 Laboratoire Aimé Cotton, CNRS, Bât. 505, Université Paris-Sud 11, 91405 Orsay Cedex, France
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Received in final form: 18 April 2011
Published online: 23 June 2011
In a newly built molecular beam apparatus we have measured permanent electric dipole moments of the B 1Π and X 1Σ+ states of NaK to test the vibrational dependence of the dipole moment function as predicted by ab initio calculations by Aymar and Dulieu [J. Chem. Phys. 122, 204302 (2005)]. Four vibrational bands were studied, the dipole moment for the B 1Π decreases from 2.73(2) D for v = 3 to 1.99(2) D for v = 13. The vibrational dependence shows a fairly good agreement with theory, but the absolute values are lower than those from the calculation by 13%. The ground state dipole moment of 2.72(6) confirms the earlier result by Wormsbecher et al. [J. Chem. Phys. 74, 6983 (1981)].
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011