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## A program for computing magnetic dipole and electric quadrupole hyperfine constants from MCHF wavefunctions

dataset

posted on 06.12.2019 by Per Jönsson, Claes-Göran Wahlström, Charlotte Froese Fischer#### dataset

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Abstract
Given an electronic wave function, generated by the MCHF program (LS format) or the MCHF_CI program (LSJ format), this program computes the hyperfine interaction constants, A_Jand B_J . In strong experimental magnetic fields, the splitting is also affected by the off-diagonal hyperfine constants A_(J,J-1), B_(J,J-1), and B_(J,J-2)and these are computed as well, depending on the input data.
Title of program: MCHF_HFS
Catalogue Id: ACLE_v1_0
Nature of problem
The atomic hyperfine splitting is determined by the hyperfine interaction constants AJ and BJ [1]. In strong external magnetic fields, where J is no longer a good quantum number, the splitting is also affected by the off-diagonal hyperfine constants AJ,J-1, BJ,J-1 and BJ,J-2 [2,3,4]. This program calculates the hyperfine constants using an electronic wavefunction generated with the MCHF or MCHF_CI programs of Froese Fischer [5].
Versions of this program held in the CPC repository in Mendeley Data
ACLE_v1_0; MCHF_HFS; 10.1016/0010-4655(93)90022-5
This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)