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

• Authors: M. Kubkowska , T. Szczęśniak , T. Grycuk
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

32.70.-n; 32.70.Cs; 32.70.Jz; 33.70.-w; 34.20.-b

Discipline

• 32.70.Jz: Line shapes, widths, and shifts
• 32.70.Cs: Oscillator strengths, lifetimes, transition moments
• 33.70.-w: Intensities and shapes of molecular spectral lines and bands
• 32.70.-n: Intensities and shapes of atomic spectral lines(see also 31.15.-p Calculations and mathematical techniques)
• 34.20.-b: Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions(see also 82.20.Kh Potential energy surfaces for reactions; for potential energy surfaces in electronic structure calculations, see 31.50.-x)

• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 105
• Issue: 4
• Pages: 317-328

Dates

published

2004-04

received

2004-02-17

Contributors

author

M. Kubkowska

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

T. Szczęśniak

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

T. Grycuk

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.105.317