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Characteristic of Organic Compound Secondary Ion Mass Spectrometry and Its Crack Mechanism(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2012年第04期
Page:
53-56
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Characteristic of Organic Compound Secondary Ion Mass Spectrometry and Its Crack Mechanism
Author(s):
ZHENG Zhong-wen12 LIU Jian-chao1 LI Rong-xi1
1. School of Earth Sciences and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Shaanxi Yanchang Petroleum CO., LTD., Yan'an 716000, Shaanxi, China
Keywords:
secondary iron mass spectrometry cutinite chemical bond dissociation energy crack organic compound source rock coal
PACS:
P618.130.2
DOI:
-
Abstract:
Secondary ion mass spectrometry(SIMS)technology is widely used to analyze the chemical composition and structure characteristics of organic compound from coal and petroleum source rocks recently. Analytical method for mass spectrum of SIMS was introduced, and the characteristic of secondary ion composition of organic compound was analyzed; characteristic of mass spectrum of organic compound SIMS was comprehensively studied, and the cracking mechanism was discussed by the means of chemical kinetics principle. The results showed that aromatic nucleus was the basic structural unit of organic compound, which contained heterocycle with various oxygen-containing groups and branched chains; the crack of organic compound SIMS was controlled by the dissociation energy of different chemical bonds in the complex macromolecular structure of organic compound; the dissociation energy of α—β bond of α-carbon and β-carbon and C—C bond of branched-chain carbon were weakest in the structure of organic matter, and α—β bond and C—C bond of branched-chain carbon were easily fractured in the structure of organic chemistry; α—β bond in the structure of(C6H5)CH2—C2H5 and C—C bond of branched-chain carbon were easily fractured to form fragment ions including(C6H5)CH+2(91), C2H+5(29)and CH+3(15)in branched chain connected with benzene ring, which were the main peaks of fragment ions in mass spectrum of organic compound SIMS.

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Last Update: 2012-12-20