Time-resolved nuclear dynamics in bound and dissociating acetylene

Burger, C.; Atia-Tul-Noor, A.; Schnappinger, T.; Xu, H.; Rosenberger, P.; Haram, N.; Beaulieu, S.; Legare, F.; Alnaser, A. S.; Moshammer, R.; Sang, R. T.; Bergues, B.; Schuurman, M. S.; Vivie-Riedle, Regina de; Litvinyuk, I. und Kling, M. F. (2018): Time-resolved nuclear dynamics in bound and dissociating acetylene. In: Structural Dynamics, Bd. 5, Nr. 4, 44302

Abstract

We have investigated nuclear dynamics in bound and dissociating acetylene molecular ions in a time-resolved reaction microscopy experiment with a pair of few-cycle pulses. Vibrating bound acetylene cations or dissociating dications are produced by the first pulse. The second pulse probes the nuclear dynamics by ionization to higher charge states and Coulomb explosion of the molecule. For the bound cations, we observed vibrations in acetylene (HCCH) and its isomer vinylidene (CCHH) along the CC-bond with a periodicity of around 26 fs. For dissociating dication molecules, a clear indication of enhanced ionization is found to occur along the CH- and CC-bonds after 10 fs to 40 fs. The time-dependent ionization processes are simulated using semi-classical on-the-fly dynamics revealing the underling mechanisms.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik ; Chemie und Pharmazie > Department Chemie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik ; 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 2329-7778
• Sprache: Englisch