Photoionization mass spectrometer for studies of flame chemistry with a synchrotron light source

A flame-sampling molecular-beam photoionization mass spectrometer, recently designed and constructed for use with a synchrotron-radiation light source, provides significant improvements over previous molecular-beam mass spectrometers that have employed either electron-impact ionization or vacuum ult...

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Bibliographic Details
Published in:Review of scientific instruments 2005-09, Vol.76 (9), p.094102-1-7
Main Authors: Cool, Terrill A., McIlroy, Andrew, Qi, Fei, Westmoreland, Phillip R., Poisson, Lionel, Peterka, Darcy S., Ahmed, Musahid
Format: Article
Language:English
Subjects:
BEAMLINE
Chemical Sciences
CHEMICAL-DYNAMICS
COMBUSTION
EFFICIENCY
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ISOMERS
or physical chemistry
PROPANE
RADIATION
RESOLUTION
Theoretical and
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Description
Summary:A flame-sampling molecular-beam photoionization mass spectrometer, recently designed and constructed for use with a synchrotron-radiation light source, provides significant improvements over previous molecular-beam mass spectrometers that have employed either electron-impact ionization or vacuum ultraviolet laser photoionization. These include superior signal-to-noise ratio, soft ionization, and photon energies easily and precisely tunable [E∕ΔE(FWHM)≈250–400] over the 7.8–17-eV range required for quantitative measurements of the concentrations and isomeric compositions of flame species. Mass resolution of the time-of-flight mass spectrometer is m∕Δm=400 and sensitivity reaches ppm levels. The design of the instrument and its advantages for studies of flame chemistry are discussed.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2010307