Sixty-five new vibronic levels of the Na2 4^3∑g^+ state have been observed in the 33900-35200 cm^-1 energy region above the potential minimum of the ground state by pulsed perturbation facilitated optical-optical do...
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Sixty-five new vibronic levels of the Na2 4^3∑g^+ state have been observed in the 33900-35200 cm^-1 energy region above the potential minimum of the ground state by pulsed perturbation facilitated optical-optical double resonance (PFOODR) fluorescence excitation spectroscopy. These new data fill the gap between the low-v levels mainly observed by continuous wave (CW) PFOODR spectroscopy and the high-v levels above the 3s+3d limit observed by pulsed PFOODR with predissociation detection, Molecular constants are fitted below potential shelf around the 3s+3d atomic limit with previously published data (mainly observed by CW PFOODR) and these new data. RKR potential curve has been calculated with the new constants. The constants are: Te= 32127.090 cm^-1,ωe=121.4099(0.20720) cm^-1, Be = 0.116287(0.0002300) cm^-1, Re=3.551 A, An error of the RKR potential curve of J. Chem. Phys. 108, 7707 (1998) is corrected.
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