scholarly journals Dustbuster: a compact impact-ionization time-of-flight mass spectrometer forin situanalysis of cosmic dust

2002 ◽  
Vol 73 (1) ◽  
pp. 185-189 ◽  
Author(s):  
Daniel E. Austin ◽  
Thomas J. Ahrens ◽  
J. L. Beauchamp
Keyword(s):  
Mass Spectrometer ◽  
Impact Ionization ◽  
Time Of Flight ◽  
Cosmic Dust ◽  
Ionization Time ◽  
Flight Mass Spectrometer

scholarly journals The Cosmic Dust Analyzer: Experimental Evaluation of an Impact Ionization Model

1971 ◽  
Vol 13 ◽  
pp. 299-310
Author(s):  
J. F. Friichtenicht ◽  
N. L. Roy ◽  
D. G. Becker
Keyword(s):  
Mass Spectrometer ◽  
Relative Abundance ◽  
Microprobe Analysis ◽  
Impact Ionization ◽  
Time Of Flight ◽  
Cosmic Dust ◽  
Dust Particles ◽  
Flight Mass Spectrometer ◽  
Fractional Ionization ◽  
The Impact

Determination of the elemental composition of cosmic dust particles by means of an impact ionization time-of-flight mass spectrometer has been investigated at several institutions. In most configurations, the instrument supplies the identity of ion groups of both target and particle materials extracted from the impact plasma and the number of ions contained in each group. Experiments have shown that the fractional ionization of a given species is not constant with impact velocity nor is the fractional ionization the same for different kinds of atoms. A model of the impact ionization effect developed at TRW involves an equilibrium plasma condition with the consequence that the fractional ionization for an arbitrary atomic species can be specified by the Saha equation if the plasma volume (V) and temperature (T) are known. It follows that T can be determined by taking the ratio of the Saha equations for two elements present in the target in known concentration. (Taking the ratio negates the requirement of knowing V.) Given T, the procedure can be reversed to yield the relative abundance of elements contained in the impacting particle. To test the model, a PbZrO3-PbTiO3 target was bombarded with high velocity Fe, MoB, and NiAl particles and the number of Pb, Ti, and Zr ions was determined in a time-of-flight mass spectrometer. For each event, the relative abundance of Ti to Pb was taken as known (from electron microprobe analysis) and T was determined from the Ti-Pb measurement. The Zr to Pb ratio was found to be in good agreement with the microprobe analysis (0.38 calculated mean value compared to 0.34 actual). The result was valid for all particle materials and for a velocity range 17<v<47 km/s. T ranged from 3300 to 11 500° K and was only mildly velocity dependent.

Vacuum Ultraviolet Single-Photon Ionization Time-of-Flight Mass Spectrometer

2011 ◽  
Vol 39 (10) ◽  
pp. 1470-1475 ◽  
Author(s):  
Guo-Bin TAN ◽  
Wei GAO ◽  
Zheng-Xu HUANG ◽  
Yi HONG ◽  
Zhong FU ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Vacuum Ultraviolet ◽  
Single Photon ◽  
Time Of Flight ◽  
Ionization Time ◽  
Single Photon Ionization ◽  
Flight Mass Spectrometer ◽  
Photon Ionization

scholarly journals A small high-irradiance laser ionization time-of-flight mass spectrometer

2009 ◽  
Vol 44 (5) ◽  
pp. 780-785 ◽  
Author(s):  
Jian He ◽  
Rongfu Huang ◽  
Quan Yu ◽  
Yiming Lin ◽  
Wei Hang ◽  
...  
Keyword(s):  
Mass Spectrometer ◽  
Time Of Flight ◽  
High Irradiance ◽  
Laser Ionization ◽  
Ionization Time ◽  
Flight Mass Spectrometer
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