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Time-resolved double-resonance spectroscopy: Lifetime measurement of the 6 1 Σ g + ( 7,31 ) electronic state of molecular sodium.
Journal of Chemical Physics 2018 November 29
We report on the lifetime measurement of the 6 1 Σ g + ( 7,31 ) state of Na2 molecules, produced in a heat-pipe oven, using a time-resolved spectroscopic technique. The 6 1 Σ g + ( 7,31 ) level was populated by two-step two-color double resonance excitation via the intermediate A 1 Σ u + ( 8,30 ) state. The excitation scheme was done using two synchronized pulsed dye lasers pumped by a Nd:YAG laser operating at the second harmonics. The fluorescence emitted upon decay to the final state was measured using a time-correlated photon counting technique, as a function of argon pressure. From this, the radiative lifetime was extracted by extrapolating the plot to collision-free zero pressure. We also report the calculated radiative lifetimes of the N a 2 6 1 Σ g + ro-vibrational levels in the range of v = 0-200 with J = 1 and J = 31 using the LEVEL program for bound-bound and the BCONT program for bound-free transitions. Our calculations reveal the importance of the bound-free transitions on the lifetime calculations and a large difference of about a factor of three between the J = 1 and J = 31 for the v = 40 and v = 100, respectively, due to the wavefunction alternating between having predominantly inner and outer well amplitude.
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