HIGH-RESOLUTION VACUUM ULTRAVIOLET ABSORPTION SPECTRUM OF THE E 1Π ← X 1Σ+ TRANSITION IN CO

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Abstract
The (0–0) and (1–0) bands of the E–X transition have been observed in absorption at high resolution. The analysis of the (0–0) band identifies the E state as 1Π, thus confirming recent theoretical calculations. Λ-type doubling of the order of 0.2–0.3 cm−1 is observed at medium J values. The much weaker (0–0) band of 13C16O was also observed and analyzed. The pertinent spectroscopic constants for the E state of 12C16O are as follows: T00 = 92 930.04 cm−1, B0 = 1.9645 cm−1, and D0 = 6.50 × 10−6 cm−1. For the 13C16O molecule the corresponding constants are: T00 = 92 929.62 cm−1, B0 = 1.8773 cm−1, and D0 = 5.94 × 10−6 cm−1.