Mass spectrometer calibration of Cosmic Dust Analyzer

Details Mass spectrometer calibration of Cosmic Dust Analyzer Mass spectrometer calibration of Cosmic Dust Analyzer

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgre..108.5007a&link_type=abstract

Journal of Geophysical Research (Planets), Volume 108, Issue E2, pp. 1-1, CiteID 5007, DOI 10.1029/2002JE001912

Physics

3

Planetology: Comets And Small Bodies: Dust, Interplanetary Physics: Interplanetary Dust, Mineral Physics: Shock Wave Experiments, Planetary Sciences: Impact Phenomena (Includes Cratering), Planetary Sciences: Rings And Dust

Scientific paper

The time-of-flight (TOF) mass spectrometer (MS) of the Cosmic Dust Analyzer (CDA) instrument aboard the Cassini spacecraft is expected to be placed in orbit about Saturn to sample submicrometer-diameter ring particles and impact ejecta from Saturn's satellites. The CDA measures a mass spectrum of each particle that impacts the chemical analyzer sector of the instrument. Particles impact a Rh target plate at velocities of 1-100 km/s and produce some 10-8 to 10-5 times the particle mass of positive valence, single-charged ions. These are analyzed via a TOF MS. Initial tests employed a pulsed N2 laser acting on samples of kamacite, pyrrhotite, serpentine, olivine, and Murchison meteorite induced bursts of ions which were detected with a microchannel plate and a charge sensitive amplifier (CSA). Pulses from the N2 laser (1011 W/cm2) are assumed to simulate particle impact. Using aluminum alloy as a test sample, each pulse produces a charge of ~4.6 pC (mostly Al+1), whereas irradiation of a stainless steel target produces a ~2.8 pC (Fe+1) charge. Thus the present system yields ~10-5% of the laser energy in resulting ions. A CSA signal indicates that at the position of the microchannel plate, the ion detector geometry is such that some 5% of the laser-induced ions are collected in the CDA geometry. Employing a multichannel plate detector in this MS yields for Al-Mg-Cu alloy and kamacite targets well-defined peaks at 24 (Mg+1), 27(Al+1), and 64 (Cu+1) and 56 (Fe+1), 58 (Ni+1), and 60 (Ni+1) dalton, respectively.

Affiliated with

Also associated with

No associations

Rating

Mass spectrometer calibration of Cosmic Dust Analyzer does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Mass spectrometer calibration of Cosmic Dust Analyzer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mass spectrometer calibration of Cosmic Dust Analyzer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-923619