HD gas analysis with gas chromatography and quadrupole mass spectrometer

Abstract

A gas analyzer system has been developed to analyze Hydrogen-Deuteride (HD) gas for producing frozen-spin polarized HD targets, which are used for hadron photoproduction experiments at SPring-8. Small amounts of ortho-H 2 and para-D 2 gas mixtures (∼0.01%) in the purified HD gas are a key to realize a frozen-spin polarized target. However, there was an intrinsic difficulty to measure these small mixtures in the HD gas with a quadrupole mass spectrometer (QMS) because D + and [H 2 D] + produced from the ionization of HD molecules were misidentified as H 2 and D 2 molecules, respectively, and became backgrounds for the measurement of the H 2 and D 2 concentrations. In addition, the ortho-H 2 and para-D 2 are not distinguished from the para-H 2 and ortho-D 2 , respectively, with the QMS. In order to obtain reliable concentrations of these gas mixtures in the HD gas, we produced a new gas analyzer system combining two independent measurements with the gas chromatography and the QMS. Helium or neon gas was used as a carrier gas for the gas chromatography which was cooled at ∼110 K. The para-H 2 , ortho-H 2 , HD, and D 2 are separated using the retention time of the gas chromatography and the mass/charge ratio. Although the para-D 2 is not separated from the ortho-D 2 , the total amount of the D 2 is measured without the [H 2 D] + background. The ortho-H 2 concentration is also measured separately from the D + background. It is found that the new gas analyzer system can measure small concentrations of ∼0.01% for the otho-H 2 and D 2 with good S/N ratios.

Hydrogen Evolution during Friction from Chemisorbed Water on Metals and Alloys

“…The intensity of HD + was reasonably low compared with that of H 2 + , and no D 2 + was detected [26,27]. Because chemisorbed D 2 O or OD groups on the specimen surface are easily exchanged with H 2 O in the atmosphere, the surface density of D decreases.…”

In-Line Chemical Sensor Deployment in a Tritium Plant

“…Although many alternative sensor technologies have been described for analytes of interest in tritium fuel cycle processes (Refs. [1][2][3][4][5][6][7][8], none of these technologies have ever been directly implemented or used for detailed chemical analysis of tritiumcontaining isotopes in-situ to the process within the SRS Tritium Plant.…”