Chair: Heide Ibrahim, INRS-EMT, Varennes, Canada

  • Tomoya Okino
  • Francesca Calegari
  • AndreaTrabattoni
  • Davide Faccialà
  • Carles Serrat

#53, 8:30 – 9:00 Attosecond nonlinear Fourier transform spectroscopy of molecule with intense a-fewpulse attosecond pulse train: observation of vibrational and electron wavepackets, TOMOYA OKINO, YUSUKE FURUKAWA, YASUO NABEKAWA, SHUNGO MIYABE, A. AMANI EILANLOU, EIJI J. TAKAHASHI, KAORU YAMANOUCHI AND KATSUMI MIDORIKAWA, Attosecond electron wavepacket in a nitrogen molecule is prepared by afew- pulse attosecond pulse train and the temporal evolution is monitored by recording kinetic energy distribution of fragment ions using a-few-pulse attosecond pulse train as a probe pulse. The temporal evolution of vibrational wavepackets are recorded for identifying the electronic states involved in the formation and probe processes of electron wavepacket. Four intensity modulations from 500 as to 3.5 fs are identified and they are ascribed to the electronic motion or charge oscillation between two electronic states composing the electron wavepacket.

#54, 9:00 – 9:15 Ultrafast electron dynamics in amino acids induced by attosecond pulses, F. CALEGARI, D. AYUSO, A. TRABATTONI, S. ANUMULA, L. BELSHAW, S. DE CAMILLIS, F. FRASSETTO, L. POLETTO, A. PALACIOS, P. DECLEVA, J. GREENWOOD, F. MARTÍN, AND M. NISOLI, Attosecond technology has been proven to be a powerful tool for the observation of ultrafast electron dynamics in atoms, molecules, and solids. Here, we report on the application of isolated attosecond pulses to trigger a purely electron dynamics in a biologically-relevant molecule, the amino acid phenylalanine, which results in charge migration mainly between the amine and the carboxylic groups on a sub–4.5-fs temporal scale. The ability to initiate and observe such electronic dynamics in polyatomic molecules opens new perspectives for attosecond science, moving toward the investigation of more and more complex systems.

#55, 9:15 – 9:30 Mapping the N2 + dissociation dynamics with attosecond temporal resolution, A.TRABATTONI, M. KLINKER, J. GONZÁLEZ-VÁZQUEZ, C. LIU, G. SANSONE, R. LINGUERRI, M. HOCHLAF, J. KLEI, M. J. J. VRAKKING, F. MARTÍN, M. NISOLI, AND F. CALEGARI, The interaction of molecular nitrogen with extreme ultraviolet radiation is at the basis of many photochemical processes occurring in the Earth’s upper atmosphere. In this work, we investigate the dissociative ionization dynamics of N2 induced by isolated attosecond pulses. The momentum distribution of the produced N+ fragments was measured as a function of pump-probe delay using a velocity map imaging spectrometer. The time-dependent measurements revealed the presence of an interference pattern between two different dissociation pathways that carries the signature of the potential energy curves activated by the XUV pulse.

#56, 9:30 – 9:45 Attosecond Probing of Xenon electronic structure by two-color HHG, D. FACCIALÀ, S. PABST, B. D. BRUNER, A. G. CIRIOLO, S. DE SILVESTRI, M. DEVETTA, N.DUDOVICH, M. NEGRO, H. SOIFER, S. STAGIRA, AND C. VOZZI, The aim of this study is probing the multi-electron behavior in xenon by two-color driven high harmonic generation. We were able to study different aspects of the xenon multi-electron response by changing the relative polarization of the two colors.

#57, 9:45 – 10:00 Strong field driven coherent XUV attosecond pulse amplification, CARLES SERRAT, JOZSEF SERES, DAVID ROCA, JOSEP M. BUDESCA, ENIKOE SERES, BASTIAN AURAND, ANDREAS HOFFMANN, SHINICHI NAMBA, THOMAS KUEHL, AN CHRISTIAN SPIELMANN, We demonstrate both theoretically and with experimental measurements that weak coherent attosecond extreme ultraviolet pulses can be amplified by carefully adjusting the delay between the extreme ultraviolet pulse and an intense infrared pulse interacting with a medium. The experimental measurements using an attosecond pulse train at 110 eV in He gas driven by intense 30-fs-long laser pulses and the performed calculations clearly demonstrate that the He gas medium behaves as an amplifier of the extreme ultraviolet pulse train.