Laser-induced electron diffraction is an evolving tabletop method that aims to image ultrafast structural changes in gas-phase polyatomic molecules with sub-Ångström spatial and femtosecond temporal resolutions. Here we demonstrate the retrieval of multiple bond lengths from a polyatomic molecule by simultaneously measuring the C–C and C–H bond lengths in aligned acetylene. Our approach takes the method beyond the hitherto achieved imaging of simple diatomic molecules and is based on the combination of a 160 kHz mid-infrared few-cycle laser source with full three-dimensional electron–ion coincidence detection. Our technique provides an accessible and robust route towards imaging ultrafast processes in complex gas-phase molecules with atto- to femto-second temporal resolution. Laser-induced electron diffraction can provide structural information on gas-phase molecules with high spatial and temporal resolution. Going beyond previous diatomic cases, Pullen et al.apply this approach to acetylene and show that it can be used to measure bond lengths for polyatomic molecules.
Imaging an aligned polyatomic molecule with laser-induced electron diffraction
Michael G. Pullen,B. Wolter,Anh-Thu Le,M. Baudisch,Michael Hemmer,A. Senftleben,C. Schroter,Joachim Ullrich,R. Moshammer,Chii-Dong Lin,J. Biegert
Published 2015 in Nature Communications
ABSTRACT
PUBLICATION RECORD
- Publication year
2015
- Venue
Nature Communications
- Publication date
2015-03-11
- Fields of study
Materials Science, Physics, Chemistry, Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- 160 khz mid-infrared few-cycle laser source
The high-repetition-rate mid-infrared laser driver used to generate the ionizing pulses in the experiment.
Aliases: 160 kHz mid-IR few-cycle laser source
- aligned acetylene
Acetylene molecules prepared in an aligned geometry for the diffraction measurement.
Aliases: acetylene
- c-c bond length
The internuclear distance between the two carbon atoms in acetylene that is targeted for retrieval.
Aliases: C–C bond length
- c-h bond length
The internuclear distance between carbon and hydrogen in acetylene that is targeted for retrieval.
Aliases: C–H bond length
- full three-dimensional electron-ion coincidence detection
A detection setup that records electrons and ions together while preserving full three-dimensional momentum information.
Aliases: 3D electron-ion coincidence detection
- laser-induced electron diffraction
A tabletop technique that infers molecular structure from electrons generated by a strong laser field and then scattered by the molecule.
Aliases: LIED
- polyatomic molecule
A molecule with more than two atoms, used here as the class of target beyond diatomic systems.
Aliases: polyatomic molecules
REFERENCES
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