Berlin 2014 – scientific programme
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MO: Fachverband Molekülphysik
MO 15: Experimental Techniques 3
MO 15.2: Talk
Thursday, March 20, 2014, 10:45–11:00, BEBEL SR144
Photofragmentation imaging of vibrationally excited methyl iodide — •Alexander Dörfler, Martin Stei, Eduardo Carrascosa, and Roland Wester — Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck
In our group a crossed-beam velocity map imaging setup has been developed to study ion molecule reactions [1]. To study the effect of vibrational C-H symmetric stretch (v1=1) excitation on the dynamics and kinematics of the reaction CH3I + F− a narrowband IR-Laser system has been set up. To characterize and optimize the vibrational excitation in a CH3I molecular beam, we have applied a probing scheme based on the approach of Zhou and coworkers [3]. The basic idea is, that since the v1 vibrational excitation is mainly a spectator to the dissociation process, the initially excited CH3I can be studied by probing CH3 produced by photodissociation. In this contribution we will be present high resolution velocity images and kinetic energy distribution of the two different CH3 fragments (v1=0 and v1=1) produced by photodissociation at 266 nm ionized using a (2+1) REMPI scheme. We will compare our results to the work of Zhou et al. [2], who applied a different dissociation wavelength. Furthermore, an approach to measure rotational beam temperatures with this scheme will be discussed.
[1] R. Wester, Phys. Chem. Chem. Phys. 16, 396 (2013) [2] Hu, L., Z. Zhou, C. Dong, L. Zhang, Y. Du, M. Cheng and Q. Zhu, J. Phys. Chem. A 117(21): 4352-4357 (2013)