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Electronic Spectroscopy of YbNH2 and the Potential for Laser Cooling
Sophia Vadachkoria1, Qingqing Lei1, Timothy C Steimle2
1Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States.
Abstract:
YbNH2 has been recognized as a suitable platform for observations of parity and time-reversal symmetry violations. Gas phase electronic spectra for YbNH2 were obtained for the Ã2B2-X̃2A1 and B̃2B1-X̃2A1 band systems. Both upper states are derived from the Yb+(4f146s)NH2- → Yb+(4f146p)NH2- electron promotion. Laser excitation and dispersed fluorescence measurements yielded band origins, vibrational constants and rotational band contours. Data for the Ã-X̃ system show a Franck-Condon distribution that is favorable for laser cooling. An upper bound for the vibrational branching fraction for the 000 transition in emission was found to be 0.94, assuming negligible radiation to the low-energy Yb+(4f136s2)NH2- states. Quantum chemical calculations for the Ã-X̃ vibronic bands are reported.
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