Fission processes following core level excitation in closo-1,2-orthocarborane

Authors

• E. Rühl, Freie Universität BerlinFollow
• A. P. Hitchcock, McMaster University, Hamilton, Ontario
• J. D. Bozek, Stanford Linear Accelerator, Menlo Park, CA
• T. Tyliszczak, Lawrence-Berkeley Laboratory, Berkeley, CA
• A. L. D. Kilcoyne, Lawrence-Berkeley Laboratory, Berkeley, CA
• D. N. McIlroy, University of Idaho, ID
• A. Knop-Gericke, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
• Peter A. Dowben, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

6-2009

Comments

Published in Physica Status Solidi B 246, No. 7, 1496–1503 (2009) / DOI 10.1002/pssb.200945126

Abstract

Time-of-flight mass analysis with multi-stop coincidence detection was used to study the multi-cation ionic fragmentation of the closo carborane cage molecule closo-1,2-orthocarborane (C₂B₁₀H₁₂) following inner-shell excitation in or above the B 1s regime. Electron ion coincidence spectra reveal the cationic products which are formed after core level excitation. Distinct changes in fragmentation pattern are observed as a function of excitation energy. Photoelectron–photoion– photoion coincidence (PEPIPICO) spectroscopy was used to study the dominant fission routes in the core level excitation regime. Series of ion pairs are identified, where asymmetric fission dominates, leading to ion pairs of different mass. Suitable fission and fragmentation mechanisms are discussed.