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題名: Low-Lying Two-Photon Excitations in Poly(p-phenylene Vinylene) and Its Derivatives
作者: Guo, Fang-Yeong;Shih, Z. Y.
貢獻者: 物理學系
日期: 2003-03
上傳時間: 2013-06-05T07:49:09Z
出版者: Elsevier
摘要: We study the low-lying two-photon excited states in nonlinear optical processes in poly(p-phenylene vinylene) (PPV) and its derivatives. We find that, within the Pariser–Parr–Pople (PPP) model, the mAg state in (unsubstituted) PPV is exactly the lowest two-photon excited state (i.e., the state). Due to the breaking of charge-conjugation symmetry, the 2Ag in substituted PPVs, originating from the , is weakly two-photon allowed, while the mAg has its origin from the , hence giving a strong peak in the two-photon absorption spectra.
關聯: Chemical Physics Letters, 370(3-4): 572-577
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