Analysis of flame structure by molecular-beam mass spectrometry using electron-impact and synchrotron-photon ionization
- 360 Downloads
Molecular-beam mass spectrometry (MBMS) has proven to be a powerful tool for the general analysis of flame structure, providing concentrations of radical and stable species for low-pressure flat flames since the work of Homann and Wagner in the 1960’s. In this paper, we will describe complementary measurements using electron-impact ionization with a high-mass-resolution quadrupole mass spectrometer and vacuum-ultraviolet photoionization in a time-of-flight mass spectrometer. Isomers are resolved that have not been separately detectable before in MBMS studies of flames, including C3H2, C3H4, C4H3, C4H4, C4H5, C6H6, and C2H4O. The qualitative and quantitative results of MBMS have led to advances in modeling and applying flame chemistry.
Key wordsflame structure mass spectrometry ionization synchrotron radiation isomers
- 3.A. McIlroy, T. D. Hain, H. A. Michelsen, and T. A. Cool, “A laser and molecular beam mass spectrometer study of low-pressure dimethyl ether flames,” Proc. Combust. Inst., 1647–1653 (2000).Google Scholar
- 4.T. A. Cool, A. McIlroy, P. R. Westmoreland, et al., “A photoionization mass spectrometer for studies of flame chemistry with a synchrotron light source,” Rev. Sci. Instrum., 76, 094102-1–094102-7 (2005).Google Scholar
- 6.S. G. Lias, “Ionization energy evaluation,” in: P. J. Linstrom, W. G. Mallard (eds.), Chemistry WebBook, Standard Reference Database Number 69, National Institute of Standards and Technology, Gaithersburg (2005); http://webbook.nist.gov.Google Scholar