Related Experiment Video
Updated: Jun 25, 2026

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
Published on: July 19, 2019
Electron momentum spectroscopy study of Jahn-Teller effect in cyclopropane
Zhongjun Li1, Xiangjun Chen, Xu Shan
1Department of Modern Physics and Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
Abstract:
The binding energy spectra of cyclopropane in energy range of 9-19 eV have been measured by the high resolution (e, 2e) spectrometer with 0.5 eV energy resolution. The individual electron momentum distributions for the outer valence orbitals including the two Jahn-Teller splitting components for the highest occupied molecular orbital 3e(') have been obtained. Compared with the results of high level quantum chemistry calculations, the observed different intensities of the experimental momentum profiles for the two Jahn-Teller splitting components have been phenomenologically explained, showing the influences caused by the change in molecular geometry at the instant of ionization from doubly degenerate 3e(') orbital on the electron momentum distributions. In addition, the controversial ordering of the two outer valence orbitals 3a(1)(') and 1a(2)(") has also been assigned unambiguously.
More Related Videos
09:35Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
Published on: September 18, 2016
09:57Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Related Concept Videos
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR
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.
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
Spin–Spin Coupling Constant: Overview
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
Conformations of Cycloalkanes