title: Auger decay of molecular double core-hole and its satellite states: comparison of experiment and calculation.
abstract: Auger decay of the C(2)H(2) double core-hole (DCH) states, including the single-site DCH (C1s(-2)), two-site DCH (C1s(-1)C1s(-1)), and satellite (C1s(-2)π(-1)π∗(+1)) states, has been investigated experimentally using synchrotron radiation combined with multi-electron coincidence method, and theoretically with the assumption of the two-step sequential model for Auger decay of the DCH states. The theoretical calculations can reproduce the experimental two-dimensional Auger spectra of the C(2)H(2) single-site DCH and satellite decays, and allow to assign the peaks appearing in the spectra in terms of sequential two-electron vacancy creations in the occupied valence orbitals. In case of the one-dimensional Auger spectrum of the C(2)H(2) two-site DCH decay, the experimental and calculated results agree well, but assignment of peaks is difficult because the first and second Auger components overlap each other. The theoretical calculations on the Auger decay of the N(2) single-site DCH state, approximately considering the effect of nuclear motion, suggest that the nuclear motion, together with the highly repulsive potential energy curves of the final states, makes an important effect on the energy distribution of the Auger electrons emitted in the second Auger decay.
authors.affiliation: Institute for Molecular Science, Nishigo-Naka 38, Myodaiji, Okazaki 444-8585, Japan. tashiro@ims.ac.jp
authors.forename: Motomichi
authors.initials: M
authors.lastname: Tashiro
authors.forename: Motoyoshi
authors.initials: M
authors.lastname: Nakano
authors.forename: Masahiro
authors.initials: M
authors.lastname: Ehara
authors.forename: Francis
authors.initials: F
authors.lastname: Penent
authors.forename: Lidija
authors.initials: L
authors.lastname: Andric
authors.forename: Jérôme
authors.initials: J
authors.lastname: Palaudoux
authors.forename: Kenji
authors.initials: K
authors.lastname: Ito
authors.forename: Yasumasa
authors.initials: Y
authors.lastname: Hikosaka
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Kouchi
authors.forename: Pascal
authors.initials: P
authors.lastname: Lablanquie