Abstract
The absolute photoabsorption cross section and the photoionization quantum efficiency of nitrogen have been measured using a double ion chamber and monochromated synchrotron radiation. In the wavelength range encompassed by the present study, several well-established Rydberg series give rise to prominent structure in the absorption spectrum. A molecule excited into a Rydberg state may decay either by autoionization or by predissociation into neutral products, and this competition between de-excitation processes causes variations to be observed in the photoionization quantum efficiency. The results indicate that many of the Rydberg states undergo rapid predissociation. A sum rule analysis has been carried out by combining the present absolute photoabsorption cross section with similar data covering the remaining wavelength regions.
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