Possibilities for eneregy transport into radio-frequency quadrupole by shifted supersonic gas jet. II. Accumulation and heating of ions
T14N1
V.V. Raznikov, V.V. Zelenov, E.V. Aparina
The aim of this work is establishment of ability of the supersonic jet to accumulate the dense enough ion clouds inside the quadrupole, the ion cloud being “heated” up to relatively high temperature under relatively low density of residual gas (at pressure less than 10–4 Torr). Kinetic measurements gave estimated number of accumulated ions at the beginning of the quadrupole of about 2•107 and their internal temperature of 6000 K.
Possibilities for energy pumping in radio-frequency quadrupole by shifted supersonic gas jet. Part I. Accelerated and excited atoms transmission
T13N4
V.V. Raznikov, V.V. Zelenov, E.V. Aparina, A.R. Pikhtelev, I.V. Sulimenkov
Generation of the ion beam and its transmission into a mass analyzer is one of the central problems in mass spectrometry. The use of narrowly directed supersonic gas jet has a number of advantages in comparison with other ways of sampling. The aim of the work is to confirm the declared earlier properties of the jet formed at the output of cylindrical channel when the free path length of gaseous atoms at the beginning of the channel is comparable with the channel diameter. The paper describes ability of such supersonic jet to conserve an additional energy of the jet gas atoms. Significant influence of the temperature of the gas flow on the yield of cyclohexane fragment ions was found, cyclohexane being an admixture in the noble gas jet passing through the electron ionization ion source. Possibility to obtain a stream of metastable electronically excited atoms inside the jet is also shown. The results of the work confirm an availability of the supersonic gas jet to design a high efficiency ion source inside radio-frequency quadrupole at the input of the mass analyzer.
