Threshold ionization spectroscopic investigation of supersonic jet-cooled, laser-desorbed Tryptophan

Research output: Contribution to journalArticle

  • Authors:
  • Mehran Taherkhani
  • Antonio Armentano
  • Jiri Cern
  • Klaus Muller-Dethlefs


Tryptophan (Trp) was studied by two-colour Photoionization Efficiency (PIE) and Mass Analysed Threshold Ionization (MATI) spectroscopy using a laser desorption apparatus. Conformer A of Trp was excited into the S1 state (34,878 cm−1) and the second laser was scanned around the D0 cation ground and the D1 excited state. No ionization signal into the D0 state could be found, but a clear threshold was observed for the D1 state with an ionization energy of 66,704 ± 3 cm−1 (8.27 eV). This observation is explained in terms of the electronic configurations of the S1 and cationic states.

Bibliographical metadata

Original languageUndefined
Pages (from-to)142-147
Number of pages6
JournalChemical Physics Letters
Early online date27 May 2016
StatePublished - 16 Jul 2016