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206645.0 [No comment] 13.07.2006 15:06 Released

ID: 206645.0, MPI für Kernphysik / Physics of Quantum Dynamics in Atomic Fragmentation
Deformation, nuclear motion and fragmentation of core-excited CO2 probed by multiple-ion coincidence momentum imaging
Authors:Saito, Norio; Muramatsu, Y.; Chiba, H.; Ueba, K.; Kubozuka, K.; Koyano, I.; Okada, K.; Jagutzki, O.; Czasch, A.; Weber, T.; Hattass, M.; Schmidt-Böcking, H.; Moshammer, R.; Lavollée, M.; Becker, U.
Date of Publication (YYYY-MM-DD):2004-09-17
Title of Journal:Journal of Electron Spectroscopy and Related Phenomena
Journal Abbrev.:J. Electron Spectrosc. & Relat. Phen.
Issue / Number:2-3
Start Page:183
End Page:193
Copyright:2004 Elsevier B.V.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The nuclear motion and geometry in core-excited CO2 are probed using a multiple-ion-coincidence imaging technique. We demonstrate that CO2 has a linear stable geometry in the C/O 1s−1 core-ionized state and a bent geometry in the C/O 1s−1π* core-excited state. The molecules in the C/O 1s−1π* A1 and B1 Renner–Teller states are probed to be bent in the A1 state and linear in the B1 state. The Osingle bondO correlation angle distributions are well reproduced using a Coulomb explosion model which takes account of the zero point bending motion in the ground state, the classical bending motion along the potential energy curve of the core-excited state within the core-hole lifetime and the initial inhomogeneous charge distribution in the multiply charged molecular ion just before the dissociation. When the photon energy is tuned to be higher (lower) energy than the 1s−1π* resonance center, the events for the 1s−1π* A1 states that result in the low Osingle bondO correlation angle distribution are suppressed (enhanced).
Free Keywords:Multiple-ion coincidence momentum imaging; CO2; Nuclear motion; Core-excited state; Molecular deformation; Ionic fragmentation; Coulomb explosion
External Publication Status:published
Document Type:Article
Affiliations:Fritz-Haber-Institut/Molecular Physics
MPI für Kernphysik/Group J. Ullrich/Strong-Fields Physics (R. Moshammer)
External Affiliations:National Metrology Institute of Japan, Tsukuba, Japan; Inst. of Multidisciplinary Research for Advanced Materials, Tohoku Univ., Sendai, Japan; Dept. of Material Science, Himeji Inst. of Technology, Hyogo, Japan; Dept. of Chemistry, Hiroshima Univ., Hiroshima, Japan; Inst. für Kernphysik, Univ. Frankfurt, Frankfurt/Main, Germany; LURE, Centre Univisitaire Paris-Sud, Orsay, France.