Accession Number : AD0609385

Title :   PHOTOIONIZATION OF N2 IN THE 734-805 A REGION,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF

Personal Author(s) : Cook,G. R. ; Ogawa,M.

Report Date : 20 NOV 1964

Pagination or Media Count : 31

Abstract : Absolute photoionization coefficients and ionization efficiencies of N2 were measured in the 734-805 A region using a one-meter Seya-Namioka scanning vacuum monochromator with the Hopfield helium continuum as a background light source. The ion-current spectrum obtained was compared with the absorption spectrum observed photographically. Nearly all of the absorption bands with higher energies than the first ionization potential showed ion current peaks, indicating preionization. However, their ionization efficiencies showed strong fluctuations whose magnitudes decreased toward the shorter wavelengths. The spectral regions with the lowest absorption coefficients (180-340/cm) beyond the first ionization potential showed the highest efficiencies, the values of which were about 80%. Efficiencies of bands with m > or = 5 of the Ogawa - Tanaka Rydberg series were much larger than those of the corresponding bands of the Worley third Rydberg series. The progressions (1) and (2) had a rather high efficiency of 70% which increased slightly with an increase of the vibrational quantum numbers of the upper electronic states. (Author)

Descriptors :   (*NITROGEN, PHOTOCHEMICAL REACTIONS), (*IONIZATION, NITROGEN), SPECTROSCOPY, ABSORPTION SPECTRA, IONIC CURRENT, VIBRATION, TABLES(DATA)

Distribution Statement : APPROVED FOR PUBLIC RELEASE