Broadband velocity modulation spectroscopy of HfF^+: towards a measurement of the electron electric dipole moment

TL;DR

This paper reports high-precision spectroscopy of HfF^+ ions, providing essential data for future electron electric dipole moment measurements, which could reveal new physics beyond the standard model.

Contribution

It presents extensive survey spectroscopy of HfF^+ covering 19 bands, delivering rovibrational constants crucial for eEDM experimental development.

Findings

High-precision rovibrational constants obtained for eight electronic states.

Spectroscopy covers nearly 5000 cm^(-1) across 19 bands.

Data supports state preparation and readout in eEDM experiments.

Abstract

Precision spectroscopy of trapped HfF^+ will be used in a search for the permanent electric dipole moment of the electron (eEDM). While this dipole moment has yet to be observed, various extensions to the standard model of particle physics (such as supersymmetry) predict values that are close to the current limit. We present extensive survey spectroscopy of 19 bands covering nearly 5000 cm^(-1) using both frequency-comb and single-frequency laser velocity-modulation spectroscopy. We obtain high-precision rovibrational constants for eight electronic states including those that will be necessary for state preparation and readout in an actual eEDM experiment.