Reversible photodimerization: a new type of photochromism.
Reversible photodimerization: a new type of photochromism.
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DOI：
10.1364/ao.11.000533
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发表时间：
1972-03
期刊：
影响因子：
1.9
通讯作者：
W. Tomlinson;E. Chandross;R. Fork;C. Pryde;A. Lamola
中科院分区：
文献类型：
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作者：
W. Tomlinson;E. Chandross;R. Fork;C. Pryde;A. Lamola
由多环芳烃（例如蒽）及其衍生物形成的光二聚体可以光解离为原始单体。当光二聚体保持在刚性基质中时，二聚体可以有效地重新制造，因为两个单体保持适当的光二聚关系。单体和光二聚体的吸收光谱显着不同，并且与此相关的是折射率的差异。这些特性以及室温下两种状态的稳定性使得这种系统对于具有无损读出的可逆相全息记录具有吸引力。我们研究了几种光二聚体系统作为刚性透明聚合物基质中的溶液，以及一些光二聚体的单晶。我们已经能够反复写入和擦除衍射光栅。光敏度（0.1 J cm(-2)）接近无增益系统的最大可能值，足够高，可以使用。观察到光栅散射效率在 0.01-5% 范围内。讨论了这些系统的物理、化学和光化学特性，以及一些基本的一般考虑因素。
The photodimers formed by polycyclic aromatic hydrocarbons, such as anthracene, and their derivatives can be photodissociated to the original monomers. When the photodimer is held in a rigid matrix, the dimer can be remade efficiently because the two monomers are held in the proper relationship for photodimerization. The absorption spectra of monomer and photodimer differ substantially, and associated with this is a difference in refractive index. These characteristics as well as the stability of both states at room temperature make such a system attractive for reversible phase holographic recording with nondestructive readout. We have investigated several photodimer systems as solutions in rigid transparent polymer matrices, as well as some single crystals of photodimers. We have been able to write and erase diffraction gratings repeatedly. The photosensitivities ( 0.1 J cm(-2)), which are close to the maximum possible for a system with no gain, are high enough to be useful. Grating scattering efficiencies in the range of 0.01-5% have been observed. The physical, chemical, and photochemical characteristics of these systems, as well as some basic general considerations, are discussed.