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.
Study of gaseous sample ionization by excited particles formed in glow discharge using high resolution orthogonal acceleration time-of-flight mass spectrometer
T13N4
I.V. Sulimenkov, V.S. Brusov, V.V. Zelenov, M.G. Skoblin, V.V. Filatov,
A.R. Pikhtelev, V.I. Kozlovskii
The experimental results of mass spectral analysis of volatile organic compounds in gaseous sample using a new designed of the ion source with Penning ionization by excited metastable atoms of noble gas are presented. To analyze gas flow profile effect on the metastable atom transfer and the reaction efficiency, gas dynamic simulation of the reagent gas flow profile from the discharge zone to the ionization region was performed by ANSYS software. The n-octane and toluene samples diluted with helium at 100 ppb mole concentration were used for our experiments. The resulting mass spectra of n-octane and toluene samples contain far more intensive molecular ions in comparison to the n-octane and toluene electron ionization mass spectra from NIST database. The sensitivity of 5 ions per 1 pg and 130 ions per 1 pg was achieved for n-octane and toluene molecular ions using the developed ion source combined with our mass spectrometer. The corresponding detection limits are 2.3 pg s−1 and 0.08 pg s−1 for n-octane and toluene molecular ions. The detection limit for the reported ion source was considered theoretically.
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.
Study of the dependence of peptide collision cross section on the ion bunch drift velocity in nitrogen
T12N1
Study of the dependence of peptide collision cross section
on the ion bunch drift velocity in nitrogen
A.V. Chudinov, Yu.G. Martynovich, I.V. Sulimenkov, V.S. Brusov, V.V. Filatov,
A.R. Pikhtelev, V.I. Kozlovskiy
