Abstract
Heavy polar molecules offer a great sensitivity to the electron electric dipole moment (EDM). To guide emerging searches for EDMs with molecular ions, we estimate the EDM-induced energy corrections for hydrogen halide ions and in their respective ground states. We find that the energy corrections due to EDM for the two ions differ by an unexpectedly large factor of 15. We demonstrate that a major part of this enhancement is due to a dissimilarity in the nature of the chemical bond for the two ions: the bond that is nearly of ionic character in exhibits predominantly a covalent nature in . We conclude that because of this enhancement the ion may be a potentially competitive candidate for the EDM search.
- Received 6 August 2004
DOI:https://doi.org/10.1103/PhysRevLett.94.013001
©2005 American Physical Society