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Barth, Ingo; Manz, Jörn; Shigeta, Yasuteru; Yagi, Kiyoshi
Journal of the American Chemical Society, 05/2006, Letnik: 128, Številka: 21Journal Article
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.
