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Issue 33, 2019
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Ultrafast nuclear dynamics of the acetylene cation C2H2+ and its impact on the infrared probe pulse induced C–H bond breaking efficiency

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Abstract

The ultrafast nuclear dynamics of the acetylene cation C2H2+ following photoionization of the neutral molecule is investigated using an extreme-ultraviolet pump/infrared probe setup. The observed modulation of the C2H+ fragment ion yield with pump–probe delay is related to structural changes induced by the extreme-ultraviolet pump pulse taking place on the femtosecond timescale. High-level simulations suggest that the trans-bending and C–C bond stretching motion of the C2H2+ cation govern the observed interaction with the infrared pulse. Depending on the molecular configuration at arrival of the infrared pulse, it either transfers population to higher-lying states or to the C2H2+ ground state, thereby enhancing or lowering the C2H+ yield. Our ultrafast pump–probe scheme can thus be used to track excited state nuclear dynamics with a resolution of a few femtoseconds, leading the way to studying fast dynamics also in larger hydrocarbon molecules.

Graphical abstract: Ultrafast nuclear dynamics of the acetylene cation C2H2+ and its impact on the infrared probe pulse induced C–H bond breaking efficiency

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Publication details

The article was received on 03 Jun 2019, accepted on 05 Aug 2019 and first published on 05 Aug 2019


Article type: Paper
DOI: 10.1039/C9CP03138C
Phys. Chem. Chem. Phys., 2019,21, 18380-18385
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    Ultrafast nuclear dynamics of the acetylene cation C2H2+ and its impact on the infrared probe pulse induced C–H bond breaking efficiency

    N. Hartmann, S. Bhattacharyya, F. Schlaepfer, M. Volkov, Z. Schumacher, M. Lucchini, L. Gallmann, U. Rothlisberger and U. Keller, Phys. Chem. Chem. Phys., 2019, 21, 18380
    DOI: 10.1039/C9CP03138C

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