Mass spectra formation from charged microparticles

Сысоев, А. А.; Ivanov, V. P.; Barinova, T.V.; Surkov, Yu. A.; Vysochkin, V. V.

doi:10.1016/s0168-583x(96)00460-0

Cited by 12 publications

(6 citation statements)

References 1 publication

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“…This suggests a similar formation process, i.e., desorption. 40 This is consistent with the models of non-equilibrium desorption by Krueger 41 and Knabe. 34 In contrast to this study, the authors described the impact ionization process as generally comparable with laser ionization experiments.…”

Section: Mass Line Shapesupporting

confidence: 89%

On the applicability of laser ionization for simulating hypervelocity impacts

Mocker

Grün

Sternovsky

et al. 2012

Journal of Applied Physics

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In-situ measurements, the direct interception and analysis of dust particles by spacecraft-based instrumentation, provide insights into the dynamical, physical and chemical properties of cosmic dust. The most sensitive detection methods for dust particles in space are based on impact ionization. Laser ionization is used for the test, development, and calibration of impact ionization instruments and to complement laboratory based particle impact experiments. A typical setup uses a 355 nm Nd-YAG laser with a pulse length of about 5 ns. It is necessary to investigate the properties of both processes with respect to their comparability. A study was performed to find out to what extent laser ionization can be used to simulate impact ionization. The findings show that laser ionization and impact ionization show similarities, which can be used to test the functionality of dust impact detectors, especially time-of-flight instruments. Our paper provides information on what extent these similarities hold and where their limits are. V C 2012 American Institute of Physics.

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Section: Mass Line Shapesupporting

confidence: 89%

On the applicability of laser ionization for simulating hypervelocity impacts

Mocker

Grün

Sternovsky

et al. 2012

Journal of Applied Physics

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“…The origins of hydrogen, carbon, and oxygen ions are not well understood, although such peaks have been frequently observed in impact ionization experiments by others [ Friichtenicht , 1964; Ratcliff and Allahdadi , 1996; Roy , 1975]. It is believed that they result from pump oil or adsorbed gases ionized by electron emission immediately prior to impact [ Austin et al , 2003; Novikov et al , 1988; Sysoev et al , 1992, 1997]. The peak at m/z = 27 could be C 2 H 3 + , as has been suggested from other impact experiments [ Ratcliff and Allahdadi , 1996], but could also be aluminum, which was used in constructing several parts of the instrument.…”

Section: Resultsmentioning

confidence: 99%

A compact time‐of‐flight mass spectrometer for high‐flux cosmic dust analysis

et al. 2004

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[1] Time-of-flight mass spectrometers on spacecraft are the most direct method for determining chemical composition of cosmic dust grains. Miniaturization of these instruments presents many challenges. Larger space-charge effects, greater deviations from the paraxial approximation, and various ion-optical aberrations negatively affect mass resolution in small time-of-flight instruments. We report on the building and testing of an instrument design that may reduce these effects. In addition to a linear reflectron, ions pass through a ring aperture that transmits only those ions with transverse velocity components that fall within a specific range. This novel design focuses ions onto a detector with greatly reduced spherical aberration. Space-charge effects and the effects of impact plate cratering and grid scatter are also reduced using this design. Controlled impacts of iron microparticles at several km/s demonstrate instrument performance. This instrument is suited for characterization of cosmic dust in regions of very high dust flux, such as a comet flyby, and it may also have practical laboratory or field applications.

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“…This behavior is more consistent with the parent species for higher velocity impacts being O rather than CH 4 or NH 2 , due to the high ionization energy of O. The low velocity appearance may be due to pre‐impact charge transfer [ Sysoev et al , 1997; McDonnell et al , 2001; Austin et al , 2003] generation of O ions, or the organic molecular candidates. The continued increase in the abundance of the 16 u peak with increasing impact velocity also indicates that the species is monatomic and abundant, as would be expected for a component of both the organic coating, contamination and the mineral.…”

Section: Discussionmentioning

confidence: 99%

Impact ionization mass spectra of anorthite cosmic dust analogue particles

et al. 2012

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Anorthite, the Ca‐rich end‐member of plagioclase feldspar, is a dominant mineral component of the Lunar highlands. Plagioclase feldspar is also found in comets, meteorites and stony asteroids. It is therefore expected to contribute to the population of interplanetary (and circumplanetary) dust grains within the solar system. After coating micron‐ and submicron‐sized grains of Anorthite with a conductive layer of Platinum, the mineral was successfully accelerated to hypervelocity speeds in the Max Planck Institut für Kernphysik's Van de Graaff accelerator. We present impact ionization mass spectra generated following the impacts of anorthite grains with a prototype mass spectrometer (the Large Area Mass Analyser, LAMA) designed for use in space, and discuss the behavior of the spectra with increasing impact energy. Correlation analysis is used to identify the compositions and sources of cations present in the spectra, enabling the identification of several molecular cations (e.g., CaAlO2, CaSiO2, Ca2AlO3/CaAlSi2O2) which identify anorthite as the progenitor bulk grain material.

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Mass spectra formation from charged microparticles

Cited by 12 publications

References 1 publication

On the applicability of laser ionization for simulating hypervelocity impacts

On the applicability of laser ionization for simulating hypervelocity impacts

A compact time‐of‐flight mass spectrometer for high‐flux cosmic dust analysis

Impact ionization mass spectra of anorthite cosmic dust analogue particles

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