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Long-range Interactions for the A^31_u and B^30^+_u States of Cd_2 from Line Shape Measurements

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Grycuk T., Michalicka M., Rogaczewski J.

Acta Physica Polonica A

2002

vol. 101

issue 6

825-836

We report on very precise measurements of the absorption profile of the 326.1 nm resonance line of cadmium broadened by interactions with the ground state Cd atoms under thermal equilibrium. The experimental red wing profiles, corrected for the Boltzmann factor at different temperatures, are analysed in terms of the long-range potential parameters including dispersion and resonant interactions. The resonant interaction energy constant C_3 is calculated to be 2.31×10^{-2} eV Å^3 and the van der Waals constant C_6 for difference potentials between the ground state X^10^+_ g and the excited states B^30^+_u and A^31_u of Cd_2 derived experimentally are found to be (182.6± 8) eV Å^6 and (289±4) eV Å^6, respectively. The former is determined for the first time and the latter is considerably corrected in comparison to earlier determination. The van der Waals constant C_6 for the ground state of Cd_2 is discussed and estimated to be C_6^g=(247± 40) eV Å^6.

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1 Acta Physica Polonica A

1 2002

1 Grycuk T.

1 Michalicka M.

1 Rogaczewski J.

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Long-range Interactions for the A^31_u and B^30^+_u States of Cd_2 from Line Shape Measurements