Absolute photoionization cross sections with ultra-high energy resolution for Ar, Kr, Xe and N2 in inner-shell ionization regions

The high-resolution absolute photoionization cross sections for Ar, Kr, Xe and N-2 in the inner-shell ionization region have been measured using a multi-electrode ion chamber and monochromatized synchrotron radiation. The energy ranges of the incident photons for the target gases were as follows: Ar: 242-252 eV (2p Rydberg excitation), Kr: 1650-1770 eV (near the 2p ionization thresholds), Xe: 665-720 eV (near the 3d ionization thresholds) and 880-1010 eV (near the 3p ionization thresholds), N-2: 400-425 eV (N Is excitation and ionization). It is the first time to measure the absolute ionization cross sections of Ar, Kr, Xe and N-2 over the present energy ranges with the energy resolution of over 10,000. The natural lifetime widths of 2p(3/2)(-1)4s, 2p(3/2)(-1)3d, 2p(3/2)(-1)4d and 2p(1/2)(-1)4s resonances for Ar, 3d(5/2)(-1)6p resonance for Xe, and 1s(-1) pi(g)* (v' = 0) resonance for N-2 have been obtained based on the cross sections determined. The ionization energies into the Ar+ (2p(3/2)(-1)), Ar+ (2p(1/2)(-1)) and Xe+ (3d(5/2)(-1)) ionic states are also determined using the Rydberg formula. (C) 2007 Elsevier B.V. All rights reserved.