Application of the Van de Graaff to the mass spectroscopy of simulated ice mantles of interstellar dust

Details Application of the Van de Graaff to the mass spectroscopy of simulated ice mantles of interstellar dust Application of the Van de Graaff to the mass spectroscopy of simulated ice mantles of interstellar dust

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985nimpb..10..735w&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section B, Volume 10, p. 735-737.

Physics

1

Scientific paper

The interstellar dust plays a role in the processes of star formation and is the probable precursor for comets. In clouds of dust where optical depth τ >> 1, the temperatures are T < 20 K resulting in volatiles freezing as mantles of dust. Core-mantles are of interest in the chemistry of interstellar molecules and infrared signatures of dust clouds. We have assembled a system for making mass spectroscopic measurements of the constituents of simulated mantles in conjunction with optical spectroscopy while holding the sample at T < 20 K. An (E < 0.5 mMeV/nucleon) ion beam from a Van de Graaff ``erodes'' a simulated mantle and the constituents are ejected into a quadrupole mass spectrometer. The precursor gas mixture for a simulated mantle may include H2O, CO, CH4, N2, NH3, O2, Ar, and C2H2. Gases may be electrically discharged prior to freezeout on a sapphire substrate or UV/ion irradiated after deposition. Techniques optimize detection without excessive heating of the sample. Determination of molecular weights and structure of mantle constituents having spectroscopic characteristics of interest to astrophysics is the goal.

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