This atlas summarizes the results of a recent investigation of the carbon monoxide absorption spectrum between 1060 and 1900 A. Twelve electronic transitions are observed in this region; four electric dipole allowed electric transitions from the ground state X I~+ to the A Ill, B I~+, C I~+. and Elll states, and eight forbidden transitions to the a'3~+, e3~-, a 311, D'A, d 3 A" P1-,j 31+, and c 3ll states. The following items .are presented in the atlas: (1) A photol!;raph of the spectrum with band assignments; (2) a table of band head measurements and assignments arranged by wavelength; (3) a summary of the spectroscopic constants and potential curve for each electronic state; (4) a line list, arranged by wavelength, of the observed rotational lines of the allowed transitions.
The forbidden d3Δi–X1Σ+ transition of CO has been observed in absorption at high resolution in the vacuum ultraviolet region. The intensity distribution in the rotational structure of the observed bands is in conformity with the assumption that the transition occurs on account of the interaction between the d3Δ state and a 1Π state, presumably the A1Π state. Thirteen bands of the d–X system have been analyzed yielding more extensive rotational data for the d3Δi state than were previously known. A discussion of the local perturbations in the d state by the A1Π and a3Π states is included.
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