Electron-ion-ion coincidence experiments for photofragmentation of polyatomic molecules using pulsed electric fields: Treatment of random coincidences

G. Prümper, K. Ueda

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

In molecular photofragmentation processes by soft X-rays, a number of ionic fragments can be produced, each having a different abundance and correlation with the kinetic energy of the emitted electron. For investigating these fragmentation processes, electron-ion and electron-ion-ion coincidence experiments, in which the kinetic energy of electrons are analyzed using an electrostatic analyzer while the mass of the ions is analyzed using a pulsed electric field, are very powerful. For such measurements, however, the contribution of random coincidences is substantial and affects the data in a non-trivial way. Simple intuitive subtraction methods cannot be applied. In the present paper, we describe these electron-ion and electron-ion-ion coincidence experiments together with a subtraction method for the contribution from random coincidences. We provide a comprehensive set of equations for the data treatment, including equations for the calculation of error-bars. We demonstrate the method by applying it to the fragmentation of free CF3 SF5 molecules.

Original languageEnglish
Pages (from-to)350-362
Number of pages13
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume574
Issue number2
DOIs
Publication statusPublished - 2007 May 1
Externally publishedYes

Keywords

  • Algorithm
  • Coincidence
  • PEPIPICO
  • Random coincidence

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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