paper

HD gas analysis with Gas Chromatography and Quadrupole Mass Spectrometer

arXiv:1101.5562 · doi:10.1016/j.nima.2011.02.091

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 ( $\sim$ 0.01%) in the purified HD gas are a key to realize a frozen-spin polarized target. 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. 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. It is found that the new gas analyzer system can measure small concentrations of $\sim$ 0.01% for the otho-H $_{2}$ and D $_{2}$ with good S/N ratios.

7 pages, 8 figures