Mass spectrometric detection of neutral radicals in a CH4 microwave discharge by use of Li+ ion attachment techniques
- 1 September 1993
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 74 (5) , 3009-3012
- https://doi.org/10.1063/1.354616
Abstract
The chemical species of the neutral radicals in the methane microwave (MW) discharge plasma were studied by quadrupole mass spectrometry in combination with a Li+ ion attachment technique. The approach is to have a MW discharge flow pass a lithium ion emitter and then to analyze, by quadrupole mass spectrometry, all ions formed by lithium ion attachment. Mainly, radicals such as CnH2n+1 (n=2–11) and CnH2n−1 (n=2–11) were detected. Species such as C4H3, C5H5, and C6H5 may also be produced in the process. Many such species have been identified for the first time. The presence of these species is evaluated by comparison with results from optical spectroscopy and threshold ionization mass spectrometry.This publication has 22 references indexed in Scilit:
- Mass spectrometric studies on the response mechanism of surface ionization detectors for gas chromatographyAnalytical Chemistry, 1990
- Chemical ionization mass spectrometry with lithium ion attachment to the moleculeAnalytical Chemistry, 1989
- Ionisation and appearance potentials of CH4by electron impactJournal of Physics B: Atomic and Molecular Physics, 1983
- A cavity for microwave-induced plasmas operated in helium and argon at atmospheric pressureSpectrochimica Acta Part B: Atomic Spectroscopy, 1976
- Survey of low temperature rf plasma polymerization and processingJournal of Vacuum Science and Technology, 1976
- HO2 detected by laser magnetic resonanceThe Journal of Chemical Physics, 1974
- Ion Cyclotron Resonance SpectroscopyAnnual Review of Physical Chemistry, 1971
- Ion–Molecule Reactions in a 50-MHz DischargeThe Journal of Chemical Physics, 1968
- Positive-Ion Chemistry: High Yields of Heavy Hydrocarbons from Solid Methane by Ionizing RadiationScience, 1964
- Filament Sources of Positive IonsPhysical Review B, 1936