Resolving Molecular Dynamics via High Harmonic Generation with Mid-IR Lasers
Explore the fascinating realm of high harmonic generation with mid-IR lasers in resolving molecular dynamics and various assumptions in the study of multi-electron systems. Delve into the tunneling regime, wavelength scaling, and examples involving Kr, CO, and CO2, offering insights into two-colour phase comparisons and photon energy variations.
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Presentation Transcript
Resolving molecular dynamics via high Resolving molecular dynamics via high harmonic generation with mid harmonic generation with mid- -IR lasers IR lasers B.D. Bruner1, H. Soifer1, C. Vozzi2, M. Negro3, M. Devetta3, S. Stagira3, and N. Dudovich1 1 Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100 Israel 2Istituto di Fotonica e Nanotecnologie CNR, Milan 20133, Italy 3 Dipartimento di Fisica, Politecnico di Milano, Milan 20133, Italy
Various assumptions and other things we sometimes like to think about Can multielectron systems? How general is this? Are we limited to measuring only specific molecules? What happens in molecules with multiple orbitals and multiple ionization channels? What happens if the tunneling conditions (= Keldysh parameter) are changed? we perform two-colour gating measurements with
High harmonic spectroscopy with mid-IR lasers = + . 3 17 E I U HHG cutoff energy cutoff p p 2 e = + I 2 . 3 17 E I cutoff p 2 8 mc 0 Intensity scaling leads to saturation But we can explore the tunneling regime more fully using wavelength scaling: I p = 1 For tunneling, the Keldysh parameter 2 U p = 0.6 - 0.9 (800 nm) = 0.3 - 0.6 (1300 nm)
Some examples Kr Kr = nm I ~ 1 1014 W/cm2 pulse duration = 20 fs CO CO2 2 = 1300 nm I ~ 1 1014 W/cm2 pulse duration = 40 fs Kr - odd_ev - 110614\scan7 20 30 Photon energy (eV) Photon energy (eV) 35 30 photon energy (eV) 40 40 45 50 50 55 0 0.5 1 1.5 2 2.5 Two colour phase [rad] red-blue delay (radians) Two colour phase [rad]
