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Acta Physico-Chimica Sinica

Calculation of Oscillator Strengths and Lifetimes on the Transitions of High Rydbery States of Atom Li

Guosheng Li, Zheng Neng-Wu, Su Wei, Yi Zhang, Long Pan

Published Jan 1, 1996• 1 citation
Publisher
DOI
10.3866/pku.whxb19961005

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By combining the B-spline basis set with model potential (B-spline + MP), we present oscillator strength spectra of Rydberg Li atoms in external fields. The photoabsorption spectra are analyzed. Over the narrow energy ranges considered in this paper, the structure of the spectra can be independent of the initial state chosen for a given atom. Our results are in good agreement with previous high-precision experimental data and theoretical calculations, where the R-matrix approach together with multichannel quantum defect theory (R-matrix+MQDT) was used. It is suggested that the present methods can be applied to deal with the oscillator strength spectra of Rydberg atoms in crossed electric and magnetic fields.
Using quantum-defect theory wave functions, we have computed dipole radial matrix elements involving Rydberg states of the singly-ionized alkaline-earth atoms. In order to test the results, we have calculated a set of transition probabilities, absorption oscillator strengths and radiative lifetimes for S, P, D, and F states up to n ∼30. Transition probabilities are in good agreement with available data. We report the lifetimes in terms of scaling relations of type τnl=τ0(n*)α. The variation of oscillator strengths with respect to the effective principal quantum number n* is discussed.