Mainz 2017 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 16: Posters 3: Experimental Techniques and Theoretical Approaches

MO 16.7: Poster

Donnerstag, 9. März 2017, 17:00–19:00, P OG1

Molecular processes with intense laser pulses — •Denhi Martínez^1,2, Alfonso Guerrero², Ignacio Álvarez², Thomas Pfeifer¹, Robert Moshammer¹, and Carmen Cisneros² — ¹Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — ²Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Av. Universidad s/n, Chamilpa, 62210 Cuernavaca, Morelos.

Through the interaction between strong laser fields and atoms or molecules, it is possible to elucidate the dynamical evolution in those systems. In the present work are shown some results for the dissociation and multiphoton ionisation processes of the nitromethane (CH₃NO₂) with V-UV radiation from laser pulses having nanoseconds pulse duration and at an intensity ranging from 10⁹ to 10¹⁰ W/cm² . The observed ionic fragments were identified using high resolution mass spectrometry (Reflectron and TOF technique) and provide information on the fragmentation channel. We also present how to extend this research using a femtosecond laser providing higher intensity ranges and enabling therefore to study tunneling ionization. Moreover, femtosecond laser pulses, due to their timescale, allow to obtain a clearer picture of the electron dynamics the system We combine this pump probe spectroscopy technique with a reaction microscope to determine the initial momenta of ions and electrons, based on the position and time of flight of their detection.