Unidirectional Electronic Ring Current Driven by a Few Cycle Circularly Polarized Laser Pulse:  Quantum Model Simulations for Mg−Porphyrin

A circularly polarized ultraviolet (UV) laser pulse may excite a unidirectional valence-type electronic ring current in an oriented molecule, within the pulse duration of a few femtoseconds (e.g., τ = 3.5 fs). The mechanism is demonstrated by quantum model simulation for |X〉 = |1 1A1g〉 → |E+〉 = |4 1...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2006-05, Vol.128 (21), p.7043-7049
Main Authors: Barth, Ingo, Manz, Jörn, Shigeta, Yasuteru, Yagi, Kiyoshi
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Molecular properties and interactions with photons
Multiphoton ionization and excitation to highly excited states (e.g., rydberg states)
Multiphoton ionization and excitation to highly excited states (eg, Rydberg states)
Photon interactions with molecules
Physics
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Summary:A circularly polarized ultraviolet (UV) laser pulse may excite a unidirectional valence-type electronic ring current in an oriented molecule, within the pulse duration of a few femtoseconds (e.g., τ = 3.5 fs). The mechanism is demonstrated by quantum model simulation for |X〉 = |1 1A1g〉 → |E+〉 = |4 1Eu+〉 population transfer in the model system, Mg−porphyrin. The net ring current generated by the laser pulse (I = 84.5 μA) is at least 100 times stronger than any ring current, which could be induced by means of permanent magnetic fields, with present technology.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja057197l