In the third section , i . e . chapter five , the normal raman spectra of nil2 , cul2 , pdl2 powder are studied under the excitation of laser with the wavelength of 632 . 8nm and aqueous silver colloid is prepared by pulsed laser ablation , from which the surface enhanced raman spectra of the three compounds are obtained . after preliminary assignment , the identical and different features of vibration of the compounds due to the different central metal atoms are analyzed 第三部分，即论文的第五章，我们以632 . 8nln为激发波长研究了nilz 、 culz和pdl :三种新型金属有机化合物粉末的正常拉曼光谱，并且以脉冲激光刻蚀法制备了水银胶，以其为衬底研究了三种化合物溶液在其上的表面增强拉曼光谱，通过对其拉曼光谱进行了初步指认，了解由于中心原子的不同，三种金属有机化合物分子振动的相同和区别。
With the rapid development of science and experimental technology , especially the use of laser , the high overtones of some molecules can be assessed . on the other hand , with the appearance of highly symmetrical molecules , such as cm , plenty of research have been done about the big complicated molecules 随着科学技术的日新月异，实验水平的不断提高，特别是激光技术的引入，我们已经能够得到一些分子振动的高频谱；另一方面随着具有高度对称性分子如c _ ( 60 )的发现，人们对复杂大分子开始了大量的研究。
