Compact Ultrafast Orthogonal Acceleration Time-of-Flight Mass Spectrometer for On-Line Gas Analysis by Electron Impact Ionization and Soft Single Photon Ionization Using an Electron Beam Pumped Rare Gas Excimer Lamp as VUV-Light Source

2007 ◽  
Vol 79 (21) ◽  
pp. 8118-8124 ◽  
Author(s):  
F. Mühlberger ◽  
M. Saraji-Bozorgzad ◽  
M. Gonin ◽  
K. Fuhrer ◽  
R. Zimmermann
Keyword(s):  
Electron Beam ◽  
Electron Impact ◽  
Impact Ionization ◽  
Single Photon ◽  
Gas Analysis ◽  
Rare Gas ◽  
Acceleration Time ◽  
Orthogonal Acceleration ◽  
On Line ◽  
Photon Ionization

Detection of Polycyclic Aromatic Hydrocarbons in a Soil Sample with Photon Ionization Technique

2012 ◽  
Vol 271-272 ◽  
pp. 112-115
Author(s):  
A Dan Li ◽  
Min Zi Chen ◽  
Wen Feng Guo ◽  
Ralf Zimmermann
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Soil Sample ◽  
Aromatic Hydrocarbons ◽  
Vacuum Ultraviolet ◽  
Single Photon ◽  
Rare Gas ◽  
Line Measurement ◽  
Polycyclic Aromatic ◽  
On Line ◽  
Photon Ionization

An electron beam pumped rare gas excimer lamp (EBEL) was utilized to emit the intensive vacuum ultraviolet (VUV) radiation at 126 nm for soft single photon ionization (SPI) of polycyclic aromatic hydrocarbons (PAHs) in a soil sample. The VUV light source was coupled to a compact and mobile time-of-flight mass spectrometer (TOFMS) for the on-line measurement of PAHs. The moderate desorption temperature was set at 300 °C to guarantee the rapid evaporation of the PAHs in the soil sample and without decomposition from the larger molecules. With the thermal treatment, sample extraction and cleanup steps were not needed. The system developed herein was found to perform sufficiently well to evaluate the PAHs in the environmental soil sample at ppm level.

Cross Section Ratios for the Electron Impact Production of Singly and Multiply Ionized Rare Gas Ions

1978 ◽  
Vol 33 (9) ◽  
pp. 1111-1113 ◽  
Author(s):  
F. Egger ◽  
T. D. Mark
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Mass Spectrometer ◽  
Cross Sections ◽  
Impact Ionization ◽  
Rare Gas ◽  
Ionization Cross ◽  
Single Ionization ◽  
Multiple Ionization ◽  
Ionization Cross Sections

Electron impact ionization of He, Ne, Ar, Kr and Xe has been studied with a double focussing mass spectrometer Varian MAT CH5. Ratios of various multiple ionization cross sections with respect to single ionization cross sections for He, Ne, Ar, Kr and Xe at electron energies of 50, 100 and 150eV are given. These cross section ratios are com­pared with previous determinations.

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