2,2'-二甲基-对三联苯的四光子激发
Four-Photon Excitation of 2,2'-Dimethyl--terphenyl.
作者信息
Gryczynski Ignacy, Piszczek Grzegorz, Gryczynski Zygmunt, Lakowicz Joseph R
机构信息
University of Maryland Baltimore, Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, Maryland 21201.
出版信息
J Phys Chem A. 2002 Feb 1;106(5):754-759. doi: 10.1021/jp012860n. Epub 2002 Jan 12.
We report the emission spectra, intensity decays, and anisotropy decay of 2,2'-dimethyl--terphenyl (DMT) with four-photon excitation. When excited with a fs Ti:Sapphire laser the emission intensity of DMT was found to depend on the third power of the incident intensity for excitation of 783 nm, and on the fourth power of the incident intensity for excitation at 882 nm. Surprisingly, at the highest value incident power, the emission intensity for four-photon excitation was about 10-fold less than with three-photon excitation. The emission spectra, intensity decays and correlation times were found to be identical for three- and four-photon excitation. However, the fundamental anisotropy ( ) of DMT depended on the mode of excitation. To the best of our knowledge, the value of 0.70 is the highest ever observed for an isotropic solution. These results suggest that four-photon excitation can be used with red-NIR lasers to obtain excitation of UV-absorbing chromophores.
我们报道了通过四光子激发的2,2'-二甲基 - 对三联苯（DMT）的发射光谱、强度衰减和各向异性衰减。当用飞秒钛宝石激光器激发时，发现DMT的发射强度在783nm激发时取决于入射强度的三次方，在882nm激发时取决于入射强度的四次方。令人惊讶的是，在最高入射功率下，四光子激发的发射强度比三光子激发时约低10倍。发现三光子和四光子激发的发射光谱、强度衰减和相关时间是相同的。然而，DMT的基本各向异性（ ）取决于激发模式。据我们所知，0.70的 值是在各向同性溶液中观察到的最高值。这些结果表明，四光子激发可与红 - 近红外激光器一起用于获得对紫外线吸收发色团的激发。
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