Cited by 23Laser-Matter Interactions and ApplicationsSpectroscopy and Quantum Chemical StudiesMolecular Spectroscopy and Structure

Time-resolved high-harmonic spectroscopy of the photodissociation of CH3I and CF3I

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Tehlar, A., Wörner, H. J.·2013·Molecular Physics

Abstract

The photodissociation dynamics of iodomethane (CH3I) and trifluoroiodomethane (CF3I) have been studied using time-resolved high-harmonic spectroscopy. The molecules were photoexcited in a transient grating geometry to their respective A bands by laser pulses centred at 267 nm and were probed through high-harmonic generation driven by a delayed 800 nm laser pulse. Both molecules display a fast buildup of the diffracted high harmonics (H9–H15) followed by a slower decay, while the undiffracted harmonics exhibit an opposite modulation. The time scales on which the signals reach their asymptotic values were found to be slower in CF3I compared to CH3I and to weakly increase with high-harmonic order in both molecules. In the case of CH3I the obtained time scales are in agreement with dissociation times measured by other techniques. Our results on CF3I constitute the first time-resolved measurements of the A-band dissociation. A simple theoretical model for the variation of the harmonic phase induced by the changing vertical ionisation potential is combined with one-dimensional nuclear wave-packet propagation and shown to qualitatively account for the main observations.

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Crossref · 10.1080/00268976.2013.782439

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  • Many experiments use the HHG field itself as the signal; such signals are robust but harder to interpret than a pump-probe because the spectroscopic information is convoluted with the HHG multistep mechanism.

    “Many experiments use the HHG field itself as the signal [41].Such signals are robust but harder to interpret than, e.g., a pumpprobe, since the spectroscopic information is convoluted with the HHG multistep mechanism.”

    From Roadmap of ultrafast x-ray atomic and molecular physics (2018) · cites this paper as [41]

  • Tunable, intense attosecond x-ray pulses can probe ultrafast processes such as intersystem crossing and radiationless decay and reveal the nature of elementary photophysical and photochemical events.

    “Tunable, intense attosecond x-ray pulses can probe such ultrafast processes and reveal the nature of elementary photophysical and photochemical events [41].”

    From Roadmap of ultrafast x-ray atomic and molecular physics (2018) · cites this paper as [41]

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Authors
Tehlar, A., & Wörner, H. J.
Affiliations
ETH Zurich (CH)
Venue
Molecular Physics
Published
2013-04-14
Volume
111
Issue
14-15
Pages
2057-2067
ISSN
  • 0026-8976 (ISSN-L)
  • 1362-3028
OpenAlex
W2035997712
Cited by
23
References
59
Citations by year
2025: 1 · 2024: 1 · 2021: 2 · 2020: 1 · 2019: 3 · 2018: 6 · 2017: 4 · 2016: 1 · 2015: 1 · 2014: 2 · 2013: 1
FWCI
0.86
Type
journal article
Language
en
Open access
Licence
other-oa
Locations
  • Molecular Physics (publishedVersion)
  • Repository for Publications and Research Data (ETH Zurich) (submittedVersion, other-oa)
  • ETH Zürich Research Collection
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Spectroscopy and Quantum Chemical Studies
  • Physical Sciences › Chemistry › Spectroscopy › Molecular Spectroscopy and Structure
Keywords
photodissociation dynamics, methyl iodide, CF3I, transient grating, high harmonic generation, harmonic phase, ionization potential

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