Multiple ion counting in isotope abundance mass spectrometry

S. Richter, U. Ott, F. Begemann

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We describe the performance of a multiple-collector thermal ionization mass spectrometer (Finnigan MAT 262) which has been modified by replacing the adjustable Faraday collectors with ion-counting channeltrons. This configuration allows isotope abundance measurements with very small ion beams down to 10-18 A, even if the signal is not very stable. Problems specific to the use of channeltrons and their intercalibration are discussed. Results from test measurements indicate that - apart from limitations from statistics - a precision better than 1% can be achieved for isotope ratio measurements. Such an instrument will be useful for isotope measurements, including isotope dilution measurements, where sample size is a problem. One application is the measurement of the isotopic composition of trace elements in interstellar grains in meteorites.

Original languageEnglish
Pages (from-to)91-100
Number of pages10
JournalInternational Journal of Mass Spectrometry and Ion Processes
Volume136
Issue number1
DOIs
Publication statusPublished - Sep 1 1994

Fingerprint

Isotopes
Mass spectrometry
counting
mass spectroscopy
isotopes
Ions
channel multipliers
ions
accumulators
intercalibration
Meteorites
isotope ratios
Trace Elements
Mass spectrometers
meteorites
Trace elements
trace elements
Ion beams
mass spectrometers
Dilution

Keywords

  • Channeltrons
  • Isotope abundance mass spectrometry
  • Multiple ion counting

ASJC Scopus subject areas

  • Spectroscopy

Cite this

Multiple ion counting in isotope abundance mass spectrometry. / Richter, S.; Ott, U.; Begemann, F.

In: International Journal of Mass Spectrometry and Ion Processes, Vol. 136, No. 1, 01.09.1994, p. 91-100.

Research output: Contribution to journalArticle

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