Marked influence of the nature of chemical bond on CP-violating signature in molecular ions ${\mathrm{HBr}}^{+}$ and ${\mathrm{HI}}^{+}$

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 ${\mathrm{HBr}}^{+}$ and ${\mathrm{HI}}^{+}$ in their respective ground $X^2{\Pi }_{3/2}$ states. We find that the energy corrections due to EDM for the two ions differ by an unexpectedly large factor of fifteen. 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 ${\mathrm{HBr}}^{+}$ exhibits predominantly covalent nature in ${\mathrm{HI}}^{+}$. We conclude that because of this enhancement the HI${}^{+}$ ion may be a potentially competitive candidate for the EDM search.

This manuscript has been accepted for publication in Physical Review Letters. The paper is now being prepared for publication

References in corpus (4)

• Measurement of the electron electric dipole moment using YbF molecules
• Enhancement of the electric dipole moment of the electron in PbO
• Proof of principle for a high sensitivity search for the electric dipole moment of the electron using the metastable a(1)[^3Σ^+] state of PbO
• In search of the electron dipole moment: Ab initio calculations on ^207PbO excited states

Cited by in corpus (5)

• Candidate molecular ions for an electron electric dipole moment experiment
• Towards the electron EDM search: Theoretical study of HfF+
• Efficient sympathetic motional ground-state cooling of a molecular ion
• Systematic study of relativistic and chemical enhancements of $\mathcal{P},\mathcal{T}$-odd effects in polar diatomic radicals
• Calculations of Time-Reversal Symmetry Violation Sensitivity Parameters Based on Analytic Relativistic Coupled-Cluster Gradient Theory