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Coherent ring-current migration of Mg-phthalocyanine probed by time-resolved X-ray circular dichroism

Journal Article · · Chemical Science
DOI:https://doi.org/10.1039/d2sc02768b· OSTI ID:1882452
The coherent ring current of Mg-phthalocyanine created by a broad band UV-visible pump pulse shows variation with time, where the ring currents at the corner benzene rings, around the Mg cation and on the outer ring oscillate with different time periods and the current density migrates among these regions. The 7 pairs of Eu degenerate excited states populated upon photoexcitation, generate 21 distinct coherent ring currents. We further calculate the time-resolved X-ray circular dichroism (TRXCD) spectrum of the coherences contributing to the ring current obtained by an attosecond X-ray probe pulse resonant with the nitrogen K-edge. A frequency domain TRXCD signal obtained by a Fourier transform of the signal with respect to the pump-probe delay time clearly separates the currents induced by different state pairs.
Research Organization:
University of California, Irvine, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-04ER15571
Other Award/Contract Number:
CHE-1953045
OSTI ID:
1882452
Alternate ID(s):
OSTI ID: 1904676
Journal Information:
Chemical Science, Journal Name: Chemical Science Journal Issue: 35 Vol. 13; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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