Of the rare-gas halide molecules, XeF is unique in that the two lowest Coulombic states B, Ω =½, and C, Ω=3/2, are separated in energy by nearly 0.1 eV, XeF(C) being the lower in energy of the two as illustrated in Fig. 1. Therefore, in thermal equilibrium at 300 K more than 95% of the combined population of the B and C states resides in the latter. For this reason the broadband XeF (C→A) transition, centered near 485 nm, has the potential for development of efficient tunable lasers in the blue-green region of the spectrum.
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