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Title: A combined electron-ion spectrometer for studying complete kinematics of molecular dissociation upon shell selective ionization

A combined electron-ion spectrometer has been built to study dissociation kinematics of molecular ions upon various electronic decay processes ensuing from ionization of neutral molecules. The apparatus can be used with various ionization agents. Ion time-of-flight (ToF) spectra arising from various electronic decay processes are acquired by triggering the ToF measurement in coincidence with energy analyzed electrons. The design and the performance of the spectrometer in a photoionization experiment is presented in detail. Electron spectra and ion time of flight spectra resulting from valence and 2p{sub 1/2} ionization of Argon and those from valence ionization of CO are presented to demonstrate the capability of the instrument. The fragment ion spectra show remarkable differences (both kinematic and cross sectional) dependent on the energy of the ejected electron, corresponding to various electron loss and decay mechanisms in dissociative photoionization of molecules.
Authors:
; ;  [1]
  1. Physical Research Laboratory, Navrangpura, Ahmedabad 380009 (India)
Publication Date:
OSTI Identifier:
22220536
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 7; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 74 ATOMIC AND MOLECULAR PHYSICS; ARGON; CARBON MONOXIDE; DISSOCIATION; ELECTRON LOSS; ELECTRON SPECTROMETERS; ELECTRON SPECTROSCOPY; ELECTRONS; MOLECULAR IONS; MOLECULES; PHOTOIONIZATION; SPECTRA; TIME-OF-FLIGHT METHOD; TIME-OF-FLIGHT SPECTROMETERS