# DIRECT OBSERVATION OF $^{3}\Pi_{g}$ STATES OF THE $Na_{2}$ MOLECULE BY OPTICAL-OPTICAL DOUBLE RESONANCE

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 Title: DIRECT OBSERVATION OF $^{3}\Pi_{g}$ STATES OF THE $Na_{2}$ MOLECULE BY OPTICAL-OPTICAL DOUBLE RESONANCE Creators: Li, Li; Field, R. W. Issue Date: 1983 Publisher: Ohio State University Abstract: Six $Na_{2}$ vibrational levels of $^{3}\Pi_{0g}$ symmetry have been observed near $34000 cm^{-1}$ by Optical-Optical Double Resonance (OODR) fluorescence excitation spectroscopy. $Na_{2}$ molecules were excited from the $X^{1}\Sigma_{g}^{+}$ state, using a single-mode cw dye laser, to singlet-triplet mixed $J=13,14,$ or 15 levels of the $b^{3}\Pi0_{u}v=24-A^{1}\Sigma_{u}^{+}$ v=22 perturbation $complex.^{1}$ OODR transitions into the $^{3}\Pi_{0g}$ levels were detected by monitoring $^{3}\Pi_{0g}\rightarrow a^{3}\Sigma_{u}^{+}$ fluorescence near 430 nm as the wavelength of a second cw dye laser was scanned. The levels observed [FIGURE] belong to two $^{3}\Pi_{0}g$ states. The triplet character of these states was evident from the greater intensity of OODR excitation out of levels of predominant $b^{3}\Pi_{u}$ (extra lines) rather than $A^{1}\Sigma_{u}^{+}$ (main lines.) character. The $^{3}\Pi_{0}$ assignment was based on the absence of Q branch lines. Description: $^{1}$J.B. Atkinson et al., Chem. Phys. Lett. 87, 92 (1982), (tentative $v\Pi$ assignment). Author Institution: Institute of Salt Lake, Academia Sinica; Department of Chemistry, Massachusetts Institute of Technology Cambridge URI: http://hdl.handle.net/1811/11995 Other Identifiers: 1983-TF-12