Journal Article

PUBDB-2024-00541

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Few-femtosecond time-resolved study of the UV-induced dissociative dynamics of iodomethane

Colaizzi, L. (Corresponding author)Extern*DESY* ; Riabchuk, S.Extern* ; Maansson, E.DESY* ; Saraswathula, K.Extern*DESY* ; Wanie, V.CFEL*DESY* ; Trabattoni, A.DESY* ; Gonzalez Vazquez, J. (Corresponding author)Extern* ; Martin, F.Extern*XFEL.EU* ; Calegari, F. (Corresponding author)DESY*

2024
Nature Publishing Group UK [London]

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Please use a persistent id in citations: doi:10.1038/s41467-024-53183-8  doi:10.3204/PUBDB-2024-00541

Abstract: We present a combined experimental and theoretical investigation of the dissociative dynamics of iodomethane following ultraviolet (UV) photoexcitation. Wedo so by using a UV pump – near-infrared (NIR) probe scheme with an unprecedented time resolution. The short duration of the UV 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 are used to benchmark semi-classical wave packet trajectory calculations. In agreement with the experiment, the model accurately identifies the main dissociation channels and further reveals a clear signature of the conical intersection in the time-dependent yield of the iodine ion. Further, 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 UV light excitation, showcasing an ultrafast stabilization scheme against dissociation.

Note: PIF-2021-03

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Contributing Institute(s):

1. Attosecond Science and Technology (FS-ATTO)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. DFG project G:(GEPRIS)390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)
3. DFG project G:(GEPRIS)194651731 - EXC 1074: Hamburger Zentrum für ultraschnelle Beobachtung (CUI): Struktur, Dynamik und Kontrolle von Materie auf atomarer Skala (194651731) (194651731)
4. DFG project G:(GEPRIS)170620586 - SFB 925: Licht-induzierte Dynamik und Kontrolle korrelierter Quantensysteme (170620586) (170620586)
5. SoftMeter - Multi-messenger soft-field spectroscopy of molecular electronics at interfaces (101076500) (101076500)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2024

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