Erlangen 2018 – scientific programme
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MO: Fachverband Molekülphysik
MO 16: Molecules in Intense Laser Fields (joint session MO/A)
MO 16.2: Talk
Wednesday, March 7, 2018, 14:30–14:45, PA 2.150
Intermolecular vibration in (NO2)2 molecules studied with few-cycle laser pulses — Katrin Reininger, Jingming Long, Federico Furch, Marc J.J. Vrakking, •Claus P. Schulz, and Jochen Mikosch — Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin, Germany
The intermolecular vibration of the NO2 dimer molecule is an interesting object of study for high-harmonic generation and strong-field ionization probes of molecular dynamics [1]. The vibration can be conveniently excited by impulsive stimulated Raman scattering (ISRS).
Here we measure the amplitude of the intramolecular motion using photofragment kinetic energy spectroscopy. We employ a newly developed high repetition rate Optical Parametric Chirped-Pulse Amplification (OPCPA) laser system delivering sub-7 fs duration pulses [2] in combination with a novel velocity map imaging (VMI) spectrometer based on an in-vacuum pixel detector [3].
Following ISRS, the molecule is strong-field ionized to the (NO2)2+ Ag state and undergoes dissociation. We observe an oscillation in the kinetic energy release of NO2+ with pump-probe delay on the 130fs time-scale of the O2N–NO2 vibration. From the kinetic energy spectrum and the calculated potential surfaces, we determine the amplitude of the vibrational motion in the (NO2)2 ground state.
[1] W. Li, et al., Science 322, 1207 (2008).
[2] F. J. Furch, et al., Opt. Express 24, 19293 (2016).
[3] J. M. Long, et. al., J. Chem. Phys. 147, 10, 013919 (2017).