激光诱导有机物中氮元素的光谱特性分析

发布时间：2018-06-07 11:48

本文选题：光谱学 + 激光诱导击穿光谱　；参考：《光子学报》2016年10期

【摘要】：选用同时含苯环和C-N结构的有机物苯甲酰胺样品为实验对象,制备不同含氮量的样品并进行激光诱导击穿光谱实验;在不同气体环境(空气、氩气)和激光能量条件下,研究了有机物中N元素的激发特性,建立了N元素光谱信息与N元素含量之间的关联性.结果表明:在氩气环境中,含N元素样品的N原子谱线较难被探测到N,该结果说明在大气环境中探测到的N原子谱线主要源于空气中N的激发(空气中有79%的N2);在空气或氩气条件下,均能探测到较强的CN分子光谱,且与样品中N元素含量有一定的关联性,这种关联性不仅与气体环境有关还与激光能量有关;在氩气条件下,由于CN分子光谱的形成完全来源于样品,不管在低能量还是高能量条件下,均与N元素含量具有较高的相关性;在大气环境中,在低能量条件下,关联性较好(R2高于0.9),而高能量条件下,关联性较差,说明在低能量条件下,空气环境中探测到的CN主要来源于样品本身,而在高能量条件下CN分子光谱的形成受环境中氮气的影响较大.
[Abstract]:The samples of benzoamide containing benzene ring and C-N structure were selected as experimental objects. The samples with different nitrogen contents were prepared and the laser induced breakdown spectra were carried out under different gas conditions (air, argon) and laser energy. The excitation characteristics of N element in organic matter were studied, and the correlation between the spectral information of N element and the content of N element was established. The results show that in argon environment, It is difficult to detect N atom lines in N element samples. The results show that the N atom lines detected in atmospheric environment are mainly due to the excitation of N in air (79% N 2 ~ (2) in air; in air or argon, 79% N ~ (2), All of them can detect strong CN molecular spectrum and have certain correlation with N element content in the sample. This correlation is not only related to the gas environment but also to laser energy. Since the formation of CN molecular spectrum is completely derived from the sample, there is a high correlation between the formation of CN molecular spectrum and the content of N element in both low energy and high energy conditions, and in atmospheric environment, in low energy condition, The correlation of R2 is higher than 0.9%, but the correlation is poor under high energy condition, which indicates that the CN detected in air environment is mainly from the sample itself under low energy condition. However, the formation of CN molecular spectrum under high energy conditions is greatly affected by nitrogen in the environment.
【作者单位】：华南理工大学电力学院;广东省能源高效清洁利用重点实验室;广东电网公司电力科学研究院;
【基金】：国家自然科学基金(Nos.51476061,51406059) 华南理工大学中央高校基本科研业务费专项资金(No.2015ZM002)资助~~
【分类号】：TN24;O561.3

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