PHOTOIONIZATION AND ABSORPTION COEFFICIENTS OF CO IN THE 600 TO 1 000 Å REGION

Abstract

Absolute photoionization and absorption coefficients of CO have been measured in the 600 to 1 000 Å region using a 1-meter Seya-Namioka scanning vacuum ultraviolet monochromator. The Hopfield helium continuum background source was used with photoelectric detection of the dispersed light. Numerous peaks were observed at wavelengths that were found to agree well with those of a higher-resolution photographic absorption spectrum. Two well-defined ionization continua followed the first and second ionization potential. Continua due to dissociation were also observed. Efficiencies for preionization of the progressions and Rydberg bands of the sharp and of the diffuse series converging to the B 2 Σ + state were estimated. Total fluorescence emission associated with the A 2 Π state of CO + was measured, and the onset was found to contain vibrational structure.