Abstract
We present resonance enhanced two-photon ionization (RETPI) spectrum between 14,500 and 15850 cm−1 for ultracold ground state 85Rb133Cs molecules. With an assistant of optical pumping from one 1070nm laser, (2)1Π1←X1Σ+ electronic transition is distinguished from (4)3Σ+←a3Σ+ and (3)3Π←a3Σ+ transitions. Some observed RETPI spectra are globally assigned to vibrational transitions from X1Σ+(v=0−5) to (2)1Π1(v=5−20). Based on these assignments, the spectroscopic constants of X1Σ+ and (2)1Π1 are simultaneously derived, including energy separation, harmonic and anharmonic constants. Then a map of Franck-Condon factors between vibrational transitions of X1Σ+(v=0−9) and (2)1Π1(v=0−20) is plotted based on these constants. Our present work would be meaningful for continuous accumulation of ultracold 85Rb133Cs molecules in the lowest vibronic state with further optical pumping.
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