Photoionization Processes in Gases

Studies of neonL-shell excitation by impact of highly ionized heavy ions

“…These survey spectra were accumulated at modest resolution levels (200 gm slits) and took only about 4 h apiece to complete. A number of selected regions of high intensity, blended lines were studied with significantly higher resolution, a few of which are also illustrated in Figure 3, The high intensities indicate large excited state production cross-sections, which could be studied by taking account of measured beam currents, measured line intensities, solid angle subtended by the grating, target volume viewed, target number density, gold-coated grating reflectivity [9], astigmatism, and channel electron multiplier efficiency [10], as a function of wavelength. While our detector was not separately calibrated, Mack et al [10] have compared several different samples of similar detectors including that used by us in the wavelength region of interest and conclude that the differences observed are within the errors of their measurements.…”

Absorption cross-sections of atmospheric gases for use in aeronomy

“…Molecular gases include NO, NO,, N,O, H,O, CO,, CO, H,, CH,, etc. Data on these gases have been reviewed (1,13).…”

“…This In addition to the gases treated in detail, there are a number of minor constituents whose absorption cross-sections are of less importance in aeronomy. The atomic gases in this category include H, N, Ar, He, Na etc., and recent reviews are available (12,13). Molecular gases include NO, NO,, N,O, H,O, CO,, CO, H,, CH,, etc.…”

Absorption in the spectral range of the Schumann–Runge bands

“…In such cases an inferior limit for the absorption cross-section was obtained by extrapolating to zero pressure. For lower v' values a positive pressure coefficient appears which has already been reported by others (13,14). We shall not deal here with this part of our data.…”