Monitoring aromatic ring-currents in Mg-porphyrin by time-resolved circular dichroism
Journal Article
·
· Physical Chemistry Chemical Physics. PCCP
- Univ. of California, Irvine, CA (United States); Sungkyunkwan Univ., Suwon (South Korea); OSTI
- Univ. of California, Irvine, CA (United States)
- Sungkyunkwan Univ., Suwon (South Korea)
We report 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.
- Research Organization:
- Univ. of California, Irvine, CA (United States)
- Sponsoring Organization:
- National Research Foundation (NRF); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- FG02-04ER15571
- OSTI ID:
- 1849505
- Alternate ID(s):
- OSTI ID: 1716551
- Journal Information:
- Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 45 Vol. 22; ISSN 1463-9076
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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