A Tandem Time--of--Flight Spectrometer for Negative--Ion/Positive--Ion Coincidence Measurements with Soft X-ray Excitation

Christian Stråhlman, Rami Sankari, Antti Kivimäki, Robert Richter, Marcello Coreno, Ralf Nyholm

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Abstract

We present a newly constructed spectrometer for negative--ion/positive--ion coincidence spectroscopy of gaseous samples. The instrument consists of two time--of--flight ion spectrometers and a magnetic momentum filter for deflection of electrons. The instrument can measure double and triple coincidences between mass--resolved negative and positive ions with high detection efficiency. First results include identification of several negative--ion/positive--ion coincidence channels following inner-shell photoexcitation of sulfur hexaflouride (SF$_6$).
Original languageEnglish
Article number013109
JournalReview of Scientific Instruments
Volume87
Issue number1
DOIs
Publication statusPublished - 2016

Subject classification (UKÄ)

  • Accelerator Physics and Instrumentation
  • Atom and Molecular Physics and Optics

Keywords

  • Negative--ion/positive--ion coincidence spectroscopy
  • time--of--flight mass spectroscopy
  • synchrotron radiation

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