Related Experiment Video
Updated: May 16, 2026

Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
Published on: October 30, 2012
Ionization and fragmentation of methane induced by 40 eV to 480 eV synchrotron radiation: from valence to beyond core
W Wolff1, L Sigaud, E C Montenegro
1Instituto de Física, Universidade Federal do Rio de Janeiro, PO 68528, 21941-972 Rio de Janeiro, RJ, Brazil. wania@if.ufrj.br
Abstract:
Photoionization and fragmentation of gaseous methane induced by tunable synchrotron radiation were investigated in a wide energy range, from 40 eV up to 480 eV. We report electron-ion coincidence experiments by measuring the relative partial-ion yields and precursor-specific relative yields for individual fragment ions and for ion fragment pairs as a function of photon energy. The fragmentation patterns are discussed with emphasis on the transition behavior of the bond breaking reactions and of the hydrogen rearrangements from valence to core electron ionization. Below the C 1s threshold, a comparison between photon induced dissociation and electron impact data showed that the ionic fragments formation depends for both projectiles on the same final electronic state reached upon ionization.
Related Concept Videos
Chemical Ionization (CI) Mass Spectrometry
Mass Spectrometry: Molecular Fragmentation Overview
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
Mass Spectrometry: Alkyne Fragmentation
Mass Spectrometry: Alkene Fragmentation
Mass Spectrometry: Alkyl Halide Fragmentation
Ionization Energy

