Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HD gas analysis with Gas Chromatography and Quadrupole Mass Spectrometer   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.

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The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th