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

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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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1 Acta Physica Polonica A

1 2004

1 Grycuk T.

1 Kubkowska M.

1 Szczęśniak T.

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