Surface Analysis by Laser Desorption of Neutral Molecules with Fourier Transform Mass Spectrometry Detection
We have developed a new instrument that utilizes a pulsed laser to desorb neutral molecules from a surface and a Fourier transform mass spectrometer (FTMS) to detect ions that are produced by electron impact or laser ionization of the desorbed species [1,21. The Fourier transform detection method can acquire a complete mass spectrum after each laser pulse, and the mass resolution is 10 to 100 times greater than can be achieved with time-of-flight (TOF) detection. With FTMS the signal due to laser-desorbed ethylene (m/z 28.031) can be mass-resolved from that due to background nitrogen (m/z 28.006) or possible silicon (m/z 27.976) impurities in the crystal.
KeywordsLaser Pulse Laser Desorption Neutral Molecule Multiphoton Ionization Methyl Benzoate
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- 2.M.G. Sherman, J.R. Kingsley, J.C. Hemminger, and R.T. McIver, Jr.: Analytica Chimica Acta, in pressGoogle Scholar