Revealing Spectral Features in Two-Photon Absorption Spectrum of Hoechst 33342: A Combined Experimental and Quantum-Chemical Study
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- 作者：Joanna Olesiak-Banska ; Katarzyna Matczyszyn ; Robert Zale艣ny ; N. Arul Murugan ; Jacob Kongsted ; Hans 脜gren ; Wojciech Bartkowiak ; Marek Samoc
- 刊名：Journal of Physical Chemistry B
- 出版年：2013
- 出版时间：October 10, 2013
- 年：2013
- 卷：117
- 期：40
- 页码：12013-12019
- 全文大小：361K
- 年卷期：v.117,no.40(October 10, 2013)
- ISSN：1520-5207
文摘
We present the results of wide spectral range Z-scan measurements of the two-photon absorption (2PA) spectrum of the Hoechst 33342 dye. The strongest 2PA of the dye in aqueous solution is found at 575 nm, and the associated two-photon absorption cross section is 245 GM. A weak but clearly visible 2PA band at 850 nm is also observed, a feature that could not be anticipated from the one-photon absorption spectrum. On the basis of the results of hybrid quantum mechanics/molecular mechanics calculations, we put forward a notion that the long-wavelength feature observed in the two-photon absorption spectrum of Hoechst 33342 is due to the formation of dye aggregates.