Journal article

Publication year: 1979

Pages: 137-154

Journal: International journal of mass spectrometry and ion physics

Volume number: 30

Issue number: 2

ISSN: 0168-1176

DOI Link: https://doi.org/10.1016/0020-7381(79)80091-1

Publisher: Elsevier Science

Abstract: 

Special ion detectors for mass separators or spectrometers are proposed which reject a large percentage of contaminating ions of the mass m passing the exit slit for mass m_o because of scattering processes in their flight through the vacuum system. Such detectors accept ions only if they lie within a small range of angles of inclination and if they have the correct energy. Since such a detector is absolutely insensitive to ions scattered just behind the ion source and just before the exit slit, a higher rest gas pressure than normal can be tolerated in these regions, as long as a lower rest gas pressure than normal is achieved in the main separator tank, thus reducing rest gas scattering. In addition, with a better pumping geometry the rest gas pressure in the ion acceleration region is able to reduce the number of ions of wrong energy formed by charge exchange processes.

Harvard Citation style: Wollnik, H. (1979) Special ion detectors which reduce the contamination in electromagnetic isotope separators or spectrometers, International journal of mass spectrometry and ion physics, 30(2), pp. 137-154. https://doi.org/10.1016/0020-7381(79)80091-1

APA Citation style: Wollnik, H. (1979). Special ion detectors which reduce the contamination in electromagnetic isotope separators or spectrometers. International journal of mass spectrometry and ion physics. 30(2), 137-154. https://doi.org/10.1016/0020-7381(79)80091-1