Hyperfine structure of rovibrational quadrupole transitions in HD

We perform a theoretical investigation of hyperfine structure of all rovibrational quadrupole transitions in the ground electronic (1)Sigma(+) state of the HD molecule. We determine positions and intensities of 185 631 hyperfine components of 7 251 quadrupole rovibrational transitions from the O, Q and S branches. Moreover, we provide a list of hyperfine splittings of all bound states in the six isotopologues of hydrogen which we considered in previous papers. The results reported here are necessary for a reliable interpretation of accurate experimental studies of rovibrational transition frequencies in the HD isotopologue, which are useful for tests of quantum electrodynamics for molecules and searches for new physics beyond the Standard Model. (C) 2021 The Author(s). Published by Elsevier Ltd.

Automated summary

In this study, a theoretical investigation of hyperfine structure in rovibrational quadrupole transitions of the HD molecule's ground electronic state was conducted. The positions and intensities of numerous hyperfine components from different branches were determined. The results are crucial for interpreting experimental studies, testing quantum electrodynamics for molecules, and exploring new physics beyond the Standard Model.