| 1. | And someone found that symmetry molecule ' s tpa cross section is larger than asymmetry molecule ' s
还有人发现，对称型分子比不对称型分子更有利于增大分子的双光子吸收截面。 |
| 2. | However , the development of two - photon technology is confined because of the small tpa cross sections of materials
然而，由于一般材料的双光子吸收截面很小，双光子吸收的实际应用受到限制。 |
| 3. | Furthermore , with the increase of the polarity of solvent , the excited energies is decreased and the tpa cross section is increased
而且，随着溶剂极性的增加，激发态的激发能减小，双光子吸收截面增大。 |
| 4. | Recently , with the development of experiments , numerous organic materials that exhibit large tpa cross sections have been synthesized in different laboratories
近年来，随着实验技术的日益发展，实验合成了大量具有大双光子吸收截面的有机材料。 |
| 5. | The results indicate that for one dimension center conjugated organic molecules , the tree - state model can well calculate its low - excited states tpa cross sections
研究结果表明，对于一维体系的对称型共轭分子，三态模型可以很好地给出低激发态的双光子吸收截面。 |
| 6. | Theoretical calculations can not only predict the two - photon absorption intensity but also provide guideline and help for synthesis of new materials with large tpa cross sections
利用理论模型不仅可以对分子的双光子吸收强弱进行预测，还可以为实验合成具有大双光子吸收截面的分子提供重要的理论依据和指导。 |
| 7. | Four donor - acceptor conjugated carbazole derivatives for two - photon absorption optics were designed and synthesized . the spectral characteristics and the structure - activity relationship were investigated
摘要设计、合成了四个新的?唑类具有较大双光子吸收截面的化合物，研究它们的光谱特性，对双光子吸收的构效关系进行初步探索。 |
| 8. | For molecules with a given n center strong donors can result in the increasing of tpa cross sections . by caculation the d - a - a - d molecule which is constituted of bipyridine inserting in the middle of stilbene as center exhibits a maximum tpa cross section
通过计算发现，在以二苯乙烯为中心的中间插入两个氮苯构成的d - a - a - d型分子，具有最大的双光子吸收截面。 |
| 9. | At last , the structure - to - property is researched , we design a series of trans - stilbene derivatives with different arrangements of the substitutions and study their two - photon absorption properties by using the response theory method at hf level
最后，本文选取了一系列不同官能团取代的具有不同对称性的二苯乙烯系列衍生物，对其双光子吸收截面与分子结构之间的关系进行了研究。 |
| 10. | In order to understand the structure - property relationship of materials with large tpa cross sections and examine the tpa properties of these molecules , a large number of theoretical models are developed to calculate tpa cross sections of molecules
为了理解具有大双光子吸收截面的分子结构与性能之间的关系和检验这些实验中合成的分子的双光子吸收性质，理论工作者发展了各种理论模型来计算分子的双光子吸收截面。 |
