Many-body study of the g factor in boronlike argon

Abstract

Highly accurate measurements of the g factor of boronlike Ar are currently implemented within the ARTEMIS experiment at GSI (Darmstadt, Germany) and within the ALPHATRAP experiment at the MPIK (Heidelberg, Germany). A comparison with the corresponding theoretical predictions will allow one to test the modern methods of bound-state QED. However, at least three different theoretical values of the g factor have been published up to date. The systematic study of the g-factor value of Ar13+40 in the ground [(1s)2(2s)22p1]P1/22 and the first excited [(1s)2(2s)22p1]P3/22 states is performed within the high-order coupled cluster and configuration interaction theories up to the full configuration interaction treatment. Correlation contributions are discussed and results are compared with previous studies.