Detailed Spectroscopy of the Cs2 a3Sigma+u State and Implications for Measurements Sensitive to Variation of the Electron/Proton Mass Ratio
S Sainis, J. M. Sage, D DeMille, Eite Tiesinga, Svetlana Kotochigova
We present spectroscopic data on moderately bound levels in the Cs2 a3Sigma+ u state. The data have sufficient resolution to be sensitive to rotational and second-order spin-orbit splittings as well as hyperfine and vibrational structure. Quantum numbers are assigned to the levels via selection rules and a global fit to other available data for the a3Sigma + u and coupled X1Sigma+ g states. The analysis focuses in particular on nearly degenerate pairs of a and X state levels, energy differences between which can be highly sensitive to possible variations in the electron-to-proton mass ratio (cf. DeMille et al., Phys. Rev. Lett. 100, 043202 (2008)). We also characterize the electric (E1) and magnetic (M1) dipole transition strengths between nearly degenerate a and X ro-vibrational levels and find that both types of transitions are feasible with current technology and could give complementary information.
, Sage, J.
, DeMille, D.
, Tiesinga, E.
and Kotochigova, S.
Detailed Spectroscopy of the Cs2 a3Sigma+u State and Implications for Measurements Sensitive to Variation of the Electron/Proton Mass Ratio, Physical Review A, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=911503
(Accessed December 2, 2023)