Abstract
The 1 g ( 3P 1) ion-pair state of Br 2 has been observed for the first time by optical-optical double-resonance spectroscopy. The ion-pair state was excited from the X 1Σ g + ground state stepwisely through the A 3Π(1 u ) state: 1 g( 3 P 1)-A 3 Π(1 u)-X 1 Σ g + . The double-resonance transitions were then detected by the 265-nm emission which originated from the 1 g ( 3P 1) state radiating back to the A 3Π(1 u ) state. Energy level analysis of the 1 g ( 3P 1) state was made on the v = 0 to v = 9 levels of the 79Br 2 isotope species, giving the molecular parameters T e = 52 641.554(20), ω e = 153.8654(71), ω e χ e = 0.42863(69), B e = 0.042496(11), α e = 1.7005(84) × 10 −4, D e = 1.22(16) × 10 −8, and q = 1.13(23) × 10 −5 (all in cm −1 with 3σ in parentheses).
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