摘要
作为全面认识煤的二次离子质谱数据与结果的开始，本文展示了典型煤样的低质量端的二次离子质谱图。利用了含四位小数的准高分辨数据在1至20质量数据区域确定了20种正离子组成；在1至31质量数区域确定了26种负离子组成。其中，简单氮氢离子─—H3N+（m／z17．0272）、H4N+（m／z18．0355）、H2N-（m／z16.0187）、HN-（m／z15．0107），以及破氮组成离子CN-（m／z26．0036）等许多离子的组成，在煤的二次离子质谱及激光电高质谱中均属于首次检出。本文还对同类化学组成形成正离子与负离子的差异，以及对合同位素组成离子的同位素比值利用的潜力，进行了详细讨论。
The data of secondary ion mass spectrometry (SIMS) of coal are very complicated, which is attributed to the complexity of coal both in chemistry and in ionization. The exact interpretation of the spectra derived from coal,however, is very important fo understand the features or compositions of coal. The experiments of a typical coal sample were conducted by means of a secondary ion mass spectrometer with relatively high mass resolution (R≥7500,（28）Si),The goal of the whole work is to interpret all peaks in the obtained spectra,in order to acquire the basic but exact information on coal SIMS and develop the model spectra of coal SIMS. This paper as the first section of the goal shows that 20 sorts of different composltions of positive ions exactly exist within mass range from m/z 1 to m/z 20,and 26 different compositions of negative ions appear from m/z 1 to m/z 31. Some compositions of ions,such as H3N+ (m/z 17.0272, tested in this work),H4N+ (m/z 18. 0355 ), H,N- (m/z16.0187), NH- (m/z15. 0107 ), H3O+ (m/z19. 0192), H(18)O- (19. 0084 ), CNu (m/z26. 0036 ) and Ca++ (m/z19. 9805 ), have been distinguished for coal SIMS for the first time. The abundance patterns of the homogenous ions and the abundance differences between positive and negative species are discussed in detail. The potential measuring some isotopic ratios, such as (18)O- /(16)O- (O. 214: 100, tested in this work), is also deliberated.
出处
《质谱学报》
EI
CAS
CSCD
1998年第3期42-52,共11页
Journal of Chinese Mass Spectrometry Society
基金
煤炭科学基金
