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Single-photon and multi-photon ionization of infrared laser-desorbed biomolecules

✍ Scribed by Claus Köster; Jürgen Grotemeyer

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
735 KB
Volume
27
Category
Article
ISSN
1076-5174

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✦ Synopsis

Results

from investigations of the 10.5 eV photoionization of infrared laser-desorbed, jet-entrained peptides are presented. The instrumental set-up for vacuum ultraviolet generation and the coupling to a reflectron-time-of-fight mass spectrometer is described. Single-photon ionization makes possible the investigation of molecules without any chromophoric group. Examples of the application of this ionization method to di-and tripeptides containing glycine, alanine, leucine and proline are shown. A comparison between single-and multi-photon ionization of tryptophan and tryptophan-containing peptides up to four amino acids is made and discussed in terms of soft ionization and generation of fragment ions.

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