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Träfflista för sökning "WFRF:(Sundqvist B. U. R.) "

Sökning: WFRF:(Sundqvist B. U. R.)

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  • Johnson, R. E., et al. (författare)
  • Sputtering and detection of large organic molecules from Europa
  • 2018
  • Ingår i: Icarus. - : ACADEMIC PRESS INC ELSEVIER SCIENCE. - 0019-1035 .- 1090-2643. ; 309, s. 338-344
  • Tidskriftsartikel (refereegranskat)abstract
    • Mass spectroscopy of bio-molecules by heavy ion induced sputtering, which became a practical laboratory procedure, was also suggested as a potential tool for spacecraft studies of targets of interest in astrobiology. With the planning of new missions to Europa, there is renewed interest in the possibility of detecting organic molecules that might have originated in its subsurface ocean and can be sputtered from its surface often intact by impacting energetic heavy ions trapped in Jupiter's magnetosphere. Here we review the laboratory data and modeling bearing on this issue. We then give estimates of the ejection into the gas-phase of trace organic species embedded in an ice matrix on Europa's surface and their possible detection during a flyby mission. 
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  • Jonsson, Gunnar, et al. (författare)
  • Compensation for Non-normal Ejection of Large Molecular Ions in Plasma Desorption Mass Spectrometry
  • 1989
  • Ingår i: Rapid Communications in Mass Spectrometry. - : Wiley. - 0951-4198 .- 1097-0231. ; 3:6, s. 190-191
  • Tidskriftsartikel (refereegranskat)abstract
    • By introducing an Einzel lens in the field-free region of a straight time-of-flight mass spectrometer, secondary ions of large mass can be detected more efficiently in plasma-desorption mass spectrometry. This procedure compensates for the large radial velocities of large molecular ions recently observed experimentally. It is shown that large molecular ions like those of lysozyme can now be detected more efficiently, and larger molecular ions than observed before in plasma-desorption mass spectrometry (like those of bovine ovalbumin, mol. wt 45 000) can now be studied.
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