Femtosecond laser induced ionization and dissociation of gas-phase protonated leucine enkephalin
Por:
Reitsma G., Gonzalez-Magaña O., Versolato O., Door M., Hoekstra R., Suraud E., Fischer B., Camus N., Kremer M., Moshammer R., Schlathölter T.
Publicada:
1 ene 2014
Resumen:
We have combined a tandem mass spectrometer with a 780 nm fs-laser system to study photoionization and photofragmentation of trapped protonated leucine enkephalin cations for laser intensities between 2 × 1013 W/cm2 and 1 × 1014 W/cm2 and pulse durations of 15 fs. 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 750 fs. The particularly flat appearance of the pump-probe curves suggests that not a single resonance, but a broad distribution of resonances is involved. © 2014 Elsevier B.V.
Filiaciones:
Reitsma G.:
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, Netherlands
KVI Atomic and Molecular Physics, Zernikelaan 25, 9747AA Groningen, Netherlands
Gonzalez-Magaña O.:
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, Netherlands
Versolato O.:
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
Door M.:
KVI Atomic and Molecular Physics, Zernikelaan 25, 9747AA Groningen, Netherlands
Hoekstra R.:
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, Netherlands
KVI Atomic and Molecular Physics, Zernikelaan 25, 9747AA Groningen, Netherlands
Suraud E.:
Laboratoire de Physique Théorique, IRSAMC, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse Cedex 4, France
Fischer B.:
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
Camus N.:
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
Kremer M.:
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
Moshammer R.:
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
Schlathölter T.:
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, Netherlands
KVI Atomic and Molecular Physics, Zernikelaan 25, 9747AA Groningen, Netherlands
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