The development of a miniature double focusing mass spectrometer

In this paper, a developed miniature Mattauch-Herzog mass spectrometer for space exploration is introduced. The instrument is mainly composed of electron ionization source, electrostatic and magnetic analyzer, focal plane detector, which ionizes substances and measures the intensities of various ion spectral peaks. The
$\boldsymbol{90}^{\circ}$
magnetic analyzer with asymmetric structure is employed where the magnetic flux density is 0.25T. According to the experiment, the width of H
2
at 50% peak height (FWHM) is 0.0875amu which is less than 0.1amu, that is to say, the resolution capability of the instrument meets the design requirements. Besides, the sensitivity of H
2
is
$\boldsymbol{3.298\times 10^{5}}\mathbf{V}/\mathbf{Pa}$
and the minimum detectable partial pressure of H
2
is
$\boldsymbol{3.153 \times 10^{-7}}\mathbf{Pa}$
.