Energies, Fine Structures, and Hyperfine Structures of the 1s22snp  3P  (n=2–4) States for the Beryllium Atom

Chao Chen

doi:10.1155/2012/569876

Abstract

Energies and wave functions of the 1s22snp 3P (n=2–4) states for the beryllium atom are calculated with the full-core plus correlation wave functions. Fine structures and hyperfine structures are calculated with the first-order perturbation theory. For the 1s22s2p 3P state, the calculated energies, fine structure, and hyperfine structure parameters are in good agreement with the latest theoretical and experimental data in the literature; it is shown that atomic parameters of the low-lying excited states for the beryllium atom can be calculated accurately using this theoretical method. For the 1s22snp 3P (n=3,4) states, the present calculations may provide valuable reference data for future theoretical calculations and experimental measurements.

Highlights

Studies of energies, fine structures, and hyperfine structures of the low-lying excited states for the beryllium atom [1,2,3,4,5,6,7,8,9,10] have been of great interest to spectroscopists because there are many strong optical transitions suitable for spectral and hyperfine structure measurements
Studies of the low-lying excited states for the beryllium atom play an important role in developing the excited state theory of multielectron atoms and better understanding the complicated correlation effects between electrons
Energies, fine-structure splittings, and hyperfine structure parameters of the 1s22snp 3P (n = 2–4) states for the beryllium atom are calculated with the full core plus correlation (FCPC) wave functions

Summary

Introduction

Studies of energies, fine structures, and hyperfine structures of the low-lying excited states for the beryllium atom [1,2,3,4,5,6,7,8,9,10] have been of great interest to spectroscopists because there are many strong optical transitions suitable for spectral and hyperfine structure measurements. Studies of the low-lying excited states for the beryllium atom play an important role in developing the excited state theory of multielectron atoms and better understanding the complicated correlation effects between electrons. The hyperfine structure of atomic energy levels is caused by the interaction between the electrons and the electromagnetic multipole moments of the nucleus. Some properties of the atomic nucleus can be obtained by investigating the hyperfine structure of the atomic energy levels. The nuclear electric-quadrupole moment, which is difficult to measure directly with nuclear physics techniques, can be determined using the measured hyperfine structure and the accurate theoretical results

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Conclusion