Interatomic potentials for Zn2from the absorption spectra of the 213.8 nm line

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Abstract
Absorption measurements have been made in the near blue wing and over a 75 nm range in the red wing of the 213.8 nm Zn line for nine temperatures between 685 and 1030 degrees C and for Zn pressures between 2.5*10-3 and 1.3 atm. The data are analysed wit the statistical theory of broadening. At the lowest pressures and near the line centre the line is symmetrical and an oscillator strength of 1.502+or-0.044 is obtained. The red wing is assumed to arise from transitions to a single, non-degenerate excited state with a constant oscillator strength that is one-third the value for the isolated atom. The ground-state and excited-state potentials are then obtained as a function of R3-Rref3 where R is the interatomic separation and Rref is not fixed by the authors' experiment. The depth of the minimum in the ground state is 46 meV with a standard deviation of 10 meV. No minimum in the excited-state potential is seen but a lower limit of 1.2 eV for its depth is fixed. Taking one value of R from the calculation of Hay et al. (1976), the authors have constructed the potentials in terms of R between 0.27 and 1.38 nm. The authors' excited state falls below the calculated result at the smallest values of R.