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Stuttgart 2012 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Poster 1: Cold Molecules, Femtosecond Spectroscopy, Molecular Dynamics

MO 13.25: Poster

Tuesday, March 13, 2012, 16:30–19:00, Poster.IV

High Harmonic Spectroscopy of NO2: Electronic Dynamics and Molecular Dissociation — •Chung-Hsin Yang1, Christian Neidel1, Jesse Klei1, Arjan Gijsbertsen3, Marc Vrakking1, and Hans Jakob Wörner21Max-Born-Institut, Berlin — 2ETH, Zürich — 3AMOLF, Amsterdam

Time-resolved photoelectron and photoion velocity map imaging (VMI) experiments have been used to study NO2 excited close to its first dissociation limit, leading to NO (XΠ) and O (3P) fragments. The NO2 molecule was excited to its A 2B2 excited electronic state by one pump photon at a center wavelength of 395 nm, followed by a probe laser pulse in the XUV wavelength region from a high-harmonics source. The first excited electronic state of NO2, A 2B2, is embedded within the X 2A1 electronic ground state and is strongly coupled to the X 2A1 state via a conical intersection between the two potential energy surfaces. By varying the time delay between the pump and probe lasers, we probe the photodynamics of NO2 by measuring photoion and photoelectron momentum distributions. In our measurements, both NO+ and O+ yields show exponential growth ( 1-1.5ps rise time) corresponding to the dissociation time scale observed from previous energy dependence studies. For the photoelectron results, some channels with hundred femtoseconds or picoseconds dynamics have been ascribed to the ionization of NO2 molecule in X 2A1 or A 2B2 state, or fragments. However, contributions from electrons correlating with different ions and produced by different high harmonics result in a large complexity of photoelectron images.

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