Bonn 2025 – scientific programme

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MO: Fachverband Molekülphysik

MO 20: Poster – Molecular Spectroscopy and Dynamics

MO 20.4: Poster

Wednesday, March 12, 2025, 17:00–19:00, Tent

Interaction of nitro-compounds with asymmetric (ω/2ω) fs laser fields — •Panagiotis Vamvakidis and Constantine Kosmidis — Department of Physics, University of Ioannina, Ioannina 45110, Greece

The focus of our work is to deepen our understanding and, potentially, control the processes of molecular bond rearrangement using asymmetric femtosecond (fs) laser beams. These processes may lead to isomerization and therefore to a change in molecular properties. The studied nitro-compounds have attracted research interest for many years because they are energetic molecules which contribute significantly to ”brown carbon” and are also important in biological, pharmaceutical and pesticide applications [1], [2]. Of particular interest is their isomerization processes from nitro (-NO₂) to nitrite (-ONO) structure.

The asymmetric ω/2ω fs laser fields are created by spatial and temporal overlapping of the ω (800 ≤ λ ≤ 2000 nm) frequency beam with its second harmonic (2ω) (400 ≤ λ ≤ 1000 nm) [3]. Interest in this interaction stems from the presence of charge-transfer electronic states within nitro-compounds. By varying the relative phase of the two pulses we can change the shape of the asymmetric field and thus control the distribution of the electronic cloud on the molecular skeleton which offers the ability to (possibly) manipulate their isomerization.

[1] J. M. Shusterman et al. J. Phys. Chem. A, (2022)

[2] A. D. Tasker et al. J. Phys. Chem. A, (2002)

[3] E. Kechaoglou et al. J. Chem. Phys., (2021)

Keywords: Asymmetric two-color laser fields; Nitro-compounds; Femptosecond molecular dynamics; Isomerization; Strong-field interaction