Near-K-edge single, double, and triple photoionization ofC+ions

Abstract

Single, double, and triple ionization of the C + ion by a single photon have been investigated in the energy range 286 to 326 eV around the K-shell single-ionization threshold at an unprecedented level of detail. At energy resolutions as low as 12 meV, corresponding to a resolving power of 24 000, natural linewidths of the most prominent resonances could be determined. From the measurement of absolute cross sections, oscillator strengths, Einstein coefficients, multi-electron Auger decay rates and other transition parameters of the main K-shell excitation and decay processes are derived. The cross sections are compared to results of previous theoretical calculations. Mixed levels of agreement are found despite the relatively simple atomic structure of the C + ion with only 5 electrons. This paper is a follow-up of a previous Letter [Müller et al., Phys. Rev. Lett. 114, 013002 (2015)].

Mixed-State Ionic Beams: An Effective Tool for Collision Dynamics Investigations

“…Similar studies were also reported for other ions as well [76]. Recently, the photoionization measurements for mixed-state C 4+ ions were compared to dielectronic recombination cross sections of C 5+ + e − through the principle of detailed balance [72]. The metastable fraction of 10.8% was thus determined in very good agreement with calculations based on relativistic many-body perturbation theory.…”

Inner-shell X-ray absorption spectra of the cationic series NHy+ (y = 0–3)

“…Such processes are known to appear with a probability of a few percent following atomic K shell ionisation of light elements. 40,[53][54][55][56][57][58] For the molecular ions NH y + ( y = 1-3) there are more pathways, resonant and non-resonant, to create the detected N 2+ fragment compared to the two ionisation processes needed for the N + target to reach N 3+ , since hydrogen partners can leave the system either as neutral atoms or as protons. N 2+ , for instance, can be created from NH + via single Auger decay and release of a neutral hydrogen or via double Auger decay and release of a proton.…”

Photoionization and photofragmentation of singly charged positive and negative Sc3N@C80 endohedral fullerene ions

“…Two permanent experimental installations were used, namely, the PIPE (Photon-Ion Spectrometer at PETRA III) endstation [30,31] of beamline P04 [32] and the IPB (Ion-Photon Beamline) endstation [33] of beamline 10.0.1. at the ALS. Several of the most recent publications of the present collaboration on photoprocesses of ions studied at the endstations at the ALS [13,[34][35][36][37] and at PETRA III [38][39][40][41][42][43] illustrate the experimental capabilities and the latest developments.…”