Related Experiment Video
Updated: Jun 17, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Dynamics of proton migration and dissociation in core-excited ethyne probed by multiple ion momentum imaging
J Laksman1, D Céolin, M Gisselbrecht
1Department of Synchrotron Radiation Research, University of Lund, S-221 00 Lund, Sweden. joakim.laksman@sljus.lu.se
Abstract:
The study focuses on the rapid geometry change in ethyne excited near the carbon 1s edge. Core excitation and ionization lead to population of dicationic states in ethyne. We study three competing dissociation pathways associated with deprotonation in the linear ethyne molecule, and two cases of rapid proton migration. We investigate the alignment of the molecule in the excited state and find startling differences in these three cases. We present evidence for a strong anisotropy in the production of H(2)(+)/C(2)(+) fragments through a rapid deformation of the molecule to a dibridged conformation with the transition dipole moment parallel to the polarization of the exciting radiation.
Related Concept Videos
¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Proton (¹H) NMR: Chemical Shift
Absorption signals of all the protium nuclei in a...
π Electron Effects on Chemical Shift: Overview
¹H NMR of Labile Protons: Temporal Resolution
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
Chemical Ionization (CI) Mass Spectrometry

