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MO: Fachverband Molekülphysik
MO 1: Quantum-Control
MO 1.1: Vortrag
Montag, 14. März 2022, 10:30–10:45, MO-H5
Coherent control of molecular nitrogen ionization — •Aaron Ngai1, Matteo Bonanomi2,3, Lukas Bruder1, David Busto1,4, Carlo Callegari5, Paolo Carpeggiani6, Giovanni De Ninno5,7, Michele Devetta2, Michele Di Fraia5, Katrin Dulitz1, David Faccialà2, Luca Giannessi5,8, Alexei Grum-Grzhimailo9, Elena Gryzlova9, Kenichi L. Ishikawa10,11, Ioannis Makos1, Praveen K. Maroju1, Tommaso Mazza12, Michael Meyer12, Paolo Piseri3, Oksana Plekan5, Kevin C. Prince5,13, Giuseppe Sansone1, Simone Spampinati5, Frank Stienkemeier1, Kiyoshi Ueda14, and Caterina Vozzi2 — 1Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Germany — 2Istituto di Fotonica e Nanotecnologie, CNR, Milano, Italy, — 3Dipartimento di Fisica and CIMaINa, Universitá degli Studi di Milano, Italy — 4Department of Physics, Lund University, Sweden — 5Elettra - Sincrotrone Trieste S.C.p.A., Basovizza, Trieste, Italy — 6Institut für Photonik, Technische Universität Wien, Austria — 7Laboratory of Quantum Optics, University of Nova Gorica, Slovenia — 8Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, Italy — 9Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Russia — 10Graduate School of Engineering, The University of Tokyo, Japan — 11Research Institute for Photon Science and Laser Technology, The University of Tokyo, Japan — 12European XFEL, Schenefeld, Germany — 13Department of Chemistry and Biotechnology, School of Science, Swinburne University of Technology, Australia — 14Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
We investigated the coherent control of molecular photoionization by using phase-locked first and second harmonic radiation from the Free-Electron Laser FERMI. As in the case of atomic coherent control [1, 2], interference between single-photon and two-photon ionization of the valence electrons was observed, and was manifested as asymmetry in the photoelectron angular distributions. Oscillations of this asymmetry were observed as a function of the relative phase difference between the two wavelengths. In our recent experimental campaign, we used a gas mixture of molecular nitrogen and atomic neon, with the neon serving as a reference target. We impulsively aligned the nitrogen molecules in the cold molecular beam using infrared pulses, and measured the photoelectron angular distributions using a Velocity Map Imaging spectrometer. Here we present preliminary experimental results as well as preliminary results from theoretical calculations.
[1] K. C. Prince et al. Nat. Photonics 10, 176 (2016).
[2] D. You et al. Phys. Rev. X 10, 031070 (2020).