Resonant Two-Photon Ionization in Biomolecules Using Laser Desorption in Supersonic Beam-Mass Spectrometry

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Abstract:

Resonant two-photon ionization (R2PI) has been demonstrated for several classes of biomolecules in a supersonic jet. These thermally labile and nonvolatile species have been vaporized with pulsed laser desorption, with the use of a CO2 laser from a ceramic surface with subsequent entrapment in a jet expansion. R2PI is then demonstrated in a time-of-flight mass spectrometer (TOFMS) with the use of ultraviolet laser radiation at either 280 or 266 nm. The 280-nm wavelength is found to be a fairly general tool for exciting the π-π* transition of the molecules under study, viz., metabolites of catecholamines, indoleamines, and tyrosine near their respective origin regions. The resulting mass spectra exhibit soft ionization where either molecular ions or minimal fragmentation is produced. At frequencies of much higher energy than that of the origin, fragmentation becomes increasingly difficult to prevent.

Keywords: Biomolecules; Laser desorption; Mass spectrometry; Resonant two-photon ionization; Supersonic beams

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702874449057

Affiliations: Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109

Publication date: March 1, 1987

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