Line Profiles in the Far-uv Absorption Spectra of the Rare Gases

Measurement of the partial photoionization cross sections and asymmetry parameters of S atoms in the photon energy range 10.0–30.0eV using constant-ionic-state spectroscopy

“…The magnitude of q indicates qualitatively the relative probabilities of the transition to a Rydberg state and direct ionization. 29,30 If more than one closed channel exists in the region of interest and, if these channels do not interact either directly or through open channels, the photoionization cross section can be given by a superimposition of Eq. ͑4͒ over the k closed channels, 31 i.e.,…”

“…[29][30][31] This approach was used to Fig. 2͑a͒ for the other Rydberg states which are parts of series converging to the second and third ionization energy limits.…”

Photon cross sections, attenuation coefficients, and energy absorption coefficients from 10 keV to 100 GeV

“…A-edge Pratt et al [1964], Hall and Sullivan [1966], Gorshkov [1967], Forssner [1968], and Hultberg et al [1968]), but some calculations including L-and higher-shell contributions are now available (see, for example, Pratt [1960b], Gavrila [1961], Ailing and Johnson [1965], Matese and Johnson [1965], Schmickley and Pratt [1967], Brysk and Zerby [1968], and the extensive results by Rakavy and Ron [1967] (Cooper [1962(Cooper [ , 1964, Fano and Cooper [1965], Manson and Cooper [1968], and Fano and Cooper [1968] Laubert [1941], Bearden [1958,1966] In the present tabulation in the region 10 keV= E < 100 keV, we follow the subtraction procedure, using re-evaluated experimental cr tot data and scattering cross sections (ct^+ ctr) frem Storm and Israel [1967] Pratt et al [1964] used by Davisson, but also the extensive r A calculations by Hultberg et al [1968]. Although we use the results of Gavrila [1959] and Pratt [1960a] Hultberg [1959] suggested that, for practical purposes, this ratio is energy-independent, and the values in table 2.-7 are those derived by Davisson [1965] from the compilation by Kirchner [1930] of experimental A-edge data.…”

First observation of a Fano profile following one step autoionization into a double photoionization continuum

“…In a previous work, [66] photoelectron spectra of sodium have been recorded at many photon energies in the same photon energy range, showing strong variations of the relative intensity of some of the photoelectron lines in the energy region of the resonance. Using these previous data and the newly obtained results, we have been able to determine absolute values of the partial photoionization cross sections by normalization to the absolute photoabsorption cross section, to determine the Fano parameters of the resonance in the total photoabsorption cross section [67,68], and to analyze with the Starace's formulation [69] the line profiles in the different ionization channels, in particular in the double photoionization channel that shows a characteristic Fano profile.…”