二次微分和傅里叶解卷积技术的表观分辨率研究

二次微分和解卷积技术都可以提高红外光谱的表观分辨率 ,从而可以分辨谱图中重叠的峰。文章用二次微分和解卷积技术对 2 十二烷基TCNQ ,2 十五烷基TCNQ和 2 十八烷基TCNQ的红外光谱进行了处理 ,发现CH2 反对称和对称伸缩振动区域的两对吸收峰的强度与脂肪链的长度有关 ,并从实验上证实了解卷积技术比二次微分技术具有更强的表观分辨能力

A Comparative Study on the Resolution of Second Derivative and Fourier Self-Deconvolution

Infrared spectra of 2 alkyl 7,7,8,8 tetracyanoquinodimethane(C 12 H 25 TCNQ, C 15 H 31 TCNQ, C 18 H 37 TCNQ) were measured with the resolution of 1 and 4 cm -1 . In order to identify the peak number correctly in the CH 2 stretching region, second derivative and Fourier self deconvolution were applied to the infrared spectra, respectively. The overlapping bands in the CH 2 stretching region could be identified when the infrared spectra, which were measured with the resolution of 4 cm -1 , were dealt with by Fourier self deconvolution. However, the bands overlapped in the CH 2 symmetric stretching region could not be observed when these infrared spectra were dealt with by second derivative. The above results reveal that Fourier self deconvolution method is more powerful than second derivative in identifying bands that are involved in an overlapping band feature.