SMALL SIZE MASS SPECTROMETER OF HIGH RESOLUTION WITH A NON-HOMOGENEOUS MAGNETIC FIELD FOR ANALYZING LIGHT GASES.
DEPARTMENT OF THE NAVY WASHINGTON D C
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A mass spectrometer of a new design with a nonhomogeneous field for the analysis of light gases is described. A small permanent magnet can be employed, and because of the non-homogeneous field, a high resolution can be obtained which is necessary for resolution of multiplets without excessively decreasing the width of the slits, i.e., while retaining an adequate aperture ratio for the instrument. The length of the ion path in such an instrument is smaller than in a mass spectrometer with a homogeneous field of equal dispersion. For this reason, the scattering of ions in the molecules of residual gas, and consequently, the background of scattered ions, is less than in an instrument with a homogeneous field. This makes it possible to obtain a higher actual sensitivity of the mass spectrometer to small amounts of impurities. The special feature of the instrument is that its basic parts, the ion source and receiver, as well as the analyzing magnet, are contained in a cylindrical vacuum chamber, which is a direct continuation of a high-vacuum diffusion lamp. This chamber also serves as the housing for the entire instrument. Author
- Test Facilities, Equipment and Methods
- Atomic and Molecular Physics and Spectroscopy