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Femtosecond laser induced ionization and dissociation of gas-phase protonated leucine enkephalin

Authors
  • Reitsma, Geert
  • Gonzalez-Magaña, Olmo
  • Versolato, Oscar
  • Door, Meike
  • Hoekstra, Ronnie
  • Suraud, Eric
  • Fischer, Bettina
  • Camus, Nicolas
  • Kremer, Manuel
  • Moshammer, Robert
  • Schlathölter, Thomas1, 2, 3, 4
  • 1 Zernike Institute for Advanced Materials, University of Groningen
  • 2 KVI Atomic and Molecular Physics
  • 3 Laboratoire de Physique Théorique, IRSAMC, Université Paul Sabatier
  • 4 Max-Planck-Institut für Kernphysik
Type
Published Article
Journal
International Journal of Mass Spectrometry
Publisher
Elsevier BV
Publication Date
Jan 01, 2014
Accepted Date
Jan 08, 2014
Identifiers
DOI: 10.1016/j.ijms.2014.01.004
Source
Elsevier
Keywords
License
Unknown

Abstract

We have combined a tandem mass spectrometer with a 780nm fs-laser system to study photoionization and photofragmentation of trapped protonated leucine enkephalin cations for laser intensities between 2×1013W/cm2 and 1×1014W/cm2 and pulse durations of 15fs. In this intensity range, the transition from multiphoton ionization and excitation to tunneling ionization is expected to occur. The observed partial ion yield curves as a function of laser intensity exhibit a power-law dependence, indicating multiphoton absorption to be the dominating mechanism. Pump-probe studies were performed to investigate the time-evolution of the multiphoton ionization process. The partial ion yields of almost all fragmentation channels show a broad but distinct maximum at a delay-time of approximately 750fs. The particularly flat appearance of the pump-probe curves suggests that not a single resonance, but a broad distribution of resonances is involved.

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