Photoionization yields in N2 in the band series from 734 to 796 Å

Abstract

Photoionization yields in the band series in N2 from 734 to 796 Å are computed using the narrow bandwidth (Δλ = 0.04 Å) photoabsorption cross sections of Carter and the relative photoionization cross sections of Berkowitz and Chupka (Δλ = 0.12 Å). The relative data are normalized to photoionization cross section data of Samson and Cairns. The results presented for the Ogawa-Tanaka Rydberg series and Worley's third Rydberg series are in substantial agreement with the 0.2 Å bandwidth work of Cook and Ogawa although new data at higher principal quantum numbers (m = 7, 8, 9) are presented. Photoionization yields in the four Ogawa progressions are also reported. Even with less peak overlapping at higher resolution the underlying continuum appears to have an ionization yield less than unity. This result is in accord with findings in other simple diatomic molecules.

The spectrum of molecular nitrogen

“…An attempt was made to extrapolate the f-values to low pressure (see table 2 of reference [143] for a list of measured i-values for over a hundred wavelength intervals and the bands with which they are identified). Using this data" Carter and Berkowitz [144] have calculated photoionization yields for the bands in the region 734-796 A.…”