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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.

Long-Range Interactions and the Oscillator Strength for the 1_u, 0^+_u → X 0^+_g Transitions in Zn_2

100%

Kubkowska M., Szczęśniak T., Grycuk T.

Acta Physica Polonica A

2004

vol. 105

issue 4

317-328

The interaction potentials for Zn_2 electronic states {1}_u and {0}_u^+ correlated with (4 {1}^P_1+4 {1}^S_0) asymptote in the long-range region (10-25) Å and the oscillator strength f for the absorption transition to these states are derived experimentally from a careful analysis of the self-broadened resonance 213.8 nm line of Zn. It is found that although the interatomic interactions at so long distances are dominated by resonance potential of the form C_3/R^3 resulting in the Lorentzian line shape, the parameter C_3 and thus f value significantly decrease with R decreasing. This effect proved to be a linear function of R^{-1} yielding the oscillator strength for the considered line f_0=1.456 ± 0.010 from R → ∞ extrapolation. This value seems to be the most accurate experimental result as yet and shows that the best theoretical values for this quantity are overestimated. It is suggested that the long-range behaviour of the potential energy curves observed here for the first time represents the effective potentials including dominating resonance interactions and a possible slight contribution of the dispersion interactions as well as the R-dependent spin-orbit interaction.

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2 Acta Physica Polonica A

1 2004

1 2002

2 Grycuk T.

1 Kubkowska M.

1 Michalicka M.

1 Rogaczewski J.

1 Szczęśniak T.

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

Long-Range Interactions and the Oscillator Strength for the 1_u, 0^+_u → X 0^+_g Transitions in Zn_2