Issue 45, 2020

Monitoring aromatic ring-currents in Mg-porphyrin by time-resolved circular dichroism

Abstract

Time-resolved circular dichroism signals (TRCD) in the X-ray regime can directly probe the magnitude and the direction of ring currents in molecules. The electronic ring currents in Mg-porphyrin, generated by a coherent superposition of electronic states induced by a circularly polarized UV pulse, are tracked by a time-delayed circularly polarized attosecond X-ray pulse. The signals are calculated using the minimal coupling Hamiltonian, which directly makes use of transition current densities. The TRCD signals obtained from the left and right circularly polarized light pump have opposite signs, revealing the direction of the ring current. Molecular aromaticity and its role in photochemical reactions such as ring opening or closure can be studied using this technique.

Graphical abstract: Monitoring aromatic ring-currents in Mg-porphyrin by time-resolved circular dichroism

Supplementary files

Article information

Article type
Paper
Submitted
11 Sep 2020
Accepted
04 Nov 2020
First published
05 Nov 2020

Phys. Chem. Chem. Phys., 2020,22, 26605-26613

Author version available

Monitoring aromatic ring-currents in Mg-porphyrin by time-resolved circular dichroism

Y. Nam, J. R. Rouxel, J. Y. Lee and S. Mukamel, Phys. Chem. Chem. Phys., 2020, 22, 26605 DOI: 10.1039/D0CP04815A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements