The permanent dipole moment of LiCs in the ground state

TL;DR

This paper reports the first experimental measurement of the permanent electric dipole moment of deeply bound ultracold LiCs molecules in the ground state, providing key data for understanding their properties.

Contribution

The study provides the first experimental values of the permanent dipole moment for deeply bound LiCs molecules in specific vibrational states.

Findings

Measured dipole moments of 5.5(2) Debye for v''=2

Measured dipole moments of 5.3(2) Debye for v''=3

Confirmed the molecules' strong polar character

Abstract

Recently we demonstrated the formation of ultracold polar LiCs molecules in deeply bound levels of the X1S+ ground state, including the rovibrational ground state [J. Deiglmayr et al., Phys. Rev. Lett. 101, 133004 (2008)]. Here we report on the first experimental determination of the permanent electric dipole moment of deeply bound LiCs molecules. For X1S+,v"=2 and v"=3 we measure values of mu=5.5(2) Debye and 5.3(2) Debye respectively.