Measurement of polycyclic aromatic hydrocarbon (PAHs) in interplanetary dust particles

Details Measurement of polycyclic aromatic hydrocarbon (PAHs) in interplanetary dust particles Measurement of polycyclic aromatic hydrocarbon (PAHs) in interplanetary dust particles

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..309c&link_type=abstract

In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 309-310 (SEE N94-12015 01-91)

Physics

3

Cyclic Hydrocarbons, Desorption, Interplanetary Dust, Laser Spectrometers, Mass Spectra, Mass Spectrometers, Time Of Flight Spectrometers, Infrared Lasers, Ions, Laser Beams, Pulsed Lasers, Ultraviolet Lasers

Scientific paper

We report here the first definitive measurements of specific organic molecules (polycyclic aromatic hydrocarbons (PAH's)) in interplanetary dust particles (IDP's). An improved version of the microbeam-two-step laser mass spectrometer was used for the analysis. Two IDP's gave similar mass spectra showing an abundance of PAH's. Control samples, including particles of probable terrestrial origin from the same stratospheric collector, gave either null results or quite different spectra. We conclude that the PAH's are probably indigenous to the IDP's and are not terrestrial contaminants. The instrument used to study the particles is a two-step laser mass spectrometer. Constituent neutral molecules of the sample are first desorbed with a pulsed infrared laser beam focussed to 40 micrometers. In the second step, PAH's in the desorbed plume are preferentially ionized by a pulsed UV laser beam. Resulting ions produced by resonant absorption are extracted into a reflectron time-of-flight mass spectrometer. This instrument has high spatial resolution, high ion transmission, unlimited mass range, and multichannel detection of all ion masses from a single laser shot.

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