Rostock 2019 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MO: Fachverband Molekülphysik
MO 9: Molecules in Intense Laser Fields
MO 9.2: Talk
Monday, March 11, 2019, 16:30–16:45, S HS 002 Biologie
A comparative study on ionization-induced dissociation of Methane, irradiated by 800 nm and 400 nm laser fields — Lazaros Varvarezos1, Alexander Achner2, •René Wagner2, John Costello1, Michael Meyer2, and Patrik Grychtol2 — 1School of Physical Sciences and NCPST, Dublin City University, Dublin 9, Ireland — 2Small Quantum Systems Group, European XFEL GmbH, 22869 Schenefeld, Germany
Irradiation of methane by intense laser fields leads to the production of several molecular ions CHnm+ (m=1,2 with n = 0−4) and atomic fragments, such as Hnm+ (m=0,1 with n = 1,2) as a result of dissociation [1]. Previous studies on methane ionization irradiated by pulses of nanosecond duration showed an absence of the parent fragment CH4+. This was explained as a result of the dissociation into the CH3+ and a hydrogen atom. On the other hand, when the pulse duration was decreased down to a few femtoseconds all the fragment ions disappeared except for the CH4+ and CH3+ molecular ions indicating that methane did not have enough time to dissociate after the ionization step. All the aforementioned studies were confined to the fundamental wavelength of 800 nm. In the present work, we extend the study to include the second harmonic field at 400 nm.
Mathur and Rajgara, Journal of Chemical Physics 124 (2006).