Few-femtosecond time-resolved study of the UV-induced dissociative dynamics of iodomethane

Lorenzo Colaizzi (), Sergey Ryabchuk, Erik P. Månsson, Krishna Saraswathula, Vincent Wanie, Andrea Trabattoni, Jesús González-Vázquez (), Fernando Martín and Francesca Calegari ()
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Lorenzo Colaizzi: Deutsches Elektronen-Synchrotron DESY
Sergey Ryabchuk: Universität Hamburg
Erik P. Månsson: Deutsches Elektronen-Synchrotron DESY
Krishna Saraswathula: Deutsches Elektronen-Synchrotron DESY
Vincent Wanie: Deutsches Elektronen-Synchrotron DESY
Andrea Trabattoni: Deutsches Elektronen-Synchrotron DESY
Jesús González-Vázquez: Universidad Autonoma de Madrid
Fernando Martín: Universidad Autonoma de Madrid
Francesca Calegari: Deutsches Elektronen-Synchrotron DESY

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Ultraviolet (UV) light that penetrates our atmosphere initiates various photochemical and photobiological processes. However, the absence of extremely short UV pulses has so far hindered our ability to fully capture the mechanisms at the very early stages of such processes. This is important because the concerted motion of electrons and nuclei in the first few femtoseconds often determines molecular reactivity. Here we investigate the dissociative dynamics of iodomethane following UV photoexcitation, utilizing mass spectrometry with a 5 fs time resolution. The short duration of the UV pump pulse (4.2 fs) allows the ultrafast dynamics to be investigated in the absence of any external field, from well before any significant vibrational displacement occurs until dissociation has taken place. The experimental results combined with semi-classical trajectory calculations provide the identification of the main dissociation channels and indirectly reveal the signature of a conical intersection in the time-dependent yield of the iodine ion. Furthermore, we demonstrate that the UV-induced breakage of the C-I bond can be prevented when the molecule is ionized by the probe pulse within 5 fs after the UV excitation, showcasing an ultrafast stabilization scheme against dissociation.

Date: 2024
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DOI: 10.1038/s41467-024-53183-8

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