吩嗪和吡嗪的SEHR光谱中强四极相互作用的表现
Manifestation of the strong quadrupole light-molecule interaction in the SEHR spectra of phenazine and pyrazine
摘要：
本文在定性考虑某些粗糙金属表面模型附近的电磁场以及偶极和四极光分子相互作用的某些特征的基础上，论证了表面增强超拉曼散射巨增强的可能性，如偶极-四极SERS理论中所作的那样。考虑对称分子允许获得选择规则，其SEHR光谱和建立这样的规律性的外观的线，引起的完全对称的振动，变换后的单位不可约表示的分子与组，其中的元素的对称性改变z上-z。这些谱线在通常的HRS光谱中是不允许的。对吩嗪和吡嗪分子的SEHR谱的分析表明，它们的SEHR谱可以用SEHRS偶极-四极理论来解释。这些分子的SEHR光谱的分析揭示了强烈的禁带的出现，所引起的振动转换后的单位不可约表示，强烈证实了这一理论，允许详细解释整个SEHR光谱。结果证实了这种常见的机制，表面增强光学过程的分子吸附在粗糙的金属表面。
英文摘要：
The paper demonstrates possibility of giant enhancement of Surface Enhanced Hyper Raman Scattering on the base of qualitative consideration of electromagnetic field near some models of rough metal surfaces and of some features of the dipole and quadrupole light-molecule interaction, such as it was made in the dipole-quadrupole SERS theory. Consideration of symmetrical molecules allows to obtain selection rules for their SEHR spectra and establish such regularity as appearance of the lines, caused by totally symmetric vibrations, transforming after the unit irreducible representation in molecules with the groups, where the elements of symmetry change z on -z . These lines are forbidden in usual HRS spectra. Analysis of literature data on phenazine and pyrazine molecules demonstrates that their SEHR spectra can be explained by the SEHRS dipole-quadrupole theory. Analysis of the SEHR spectra of these molecules reveals appearance of strong forbidden bands, caused by vibrations transforming after the unit irreducible representation that strongly confirms this theory which allows to interpret the whole SEHR spectra in detail. The results corroborate this common mechanism of Surface Enhanced optical processes on molecules adsorbed on rough metal surfaces.
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