Progress of Cryogenics and Isotopes Separation , ISSN: 1582-2575
2012, Volume 15, Issue 1

Experimental Evidences of the Influence of Nitrogen Gas on the Trimer Ions in Low Resolution Mass Spectrometry of Hydrogen Isotopes

Nicolae Bidica * , Gheorghe Bulubașa

National Research and Development Institute for Cryogenics and Isotopic Technologies - ICSI Rm. Valcea, Uzinei Street no. 4, PO Box Râureni 7, 240050, Râmnicu Vâlcea, Romania

*Corresponding author: Nicolae Bidica, E-mail:

Published: May 2012


This paper presents experimental results regarding the behaviour of triatomic (trimer) ions formed in the electron impact ion source of a mass spectrometer in the presence of high concentrations of nitrogen gas. These results were obtained during an experimental work performed in order to find solutions to correct the total ion currents (measured at masses of interest) that are affected by isobaric interferences in low resolution mass spectrometry of hydrogen isotopes. A commercial quadrupole mass spectrometer of unit resolution, equipped with an electron impact ion source, was usedto analysehigh purity H2 and D2 and several H2/N2 and D2/N2 mixtures (of different concentrations).

The results show a high influence of nitrogen gas on trimer ions, and this influence could be used to develop new procedures for hydrogen isotopes measurement by low resolution mass spectrometry.


Hydrogen isotopes, mass spectrometry, triatomic ions (trimers).

Tag search Hydrogen isotopes mass spectrometry triatomic ions trimers