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Laser‐induced molecular ion formation and gas‐phase ion formation from polycyclic aromatic hydrocarbons, coals and coal products detected by Fourier transform mass spectrometry
Author(s) -
Greenwood Paul F.,
Strachan Michael G.,
Willett Gary D.,
Wilson Michael A.
Publication year - 1990
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210250703
Subject(s) - chemistry , fourier transform ion cyclotron resonance , mass spectrometry , mass spectrum , ion , carbon fibers , analytical chemistry (journal) , coal , polyatomic ion , environmental chemistry , organic chemistry , materials science , chromatography , composite number , composite material
The results from the laser‐ablation Fourier transform mass spectrometric examination of a variety of polyaromatic hydrocarbons (PAHs), coals and other geochemically related materials are presented. Both molecular and quasi‐molecular ions have been detected from different ring‐sized PAHs. A relationship between the ease of sodium‐adduct ion formation and the size of the aromatic array is observed. Nevertheless, suppression of [M + Na] + ion formation in PAHs can be achieved by the addition of coal. In addition, distributions of low‐mass positive‐ and negative‐ion carbon clusters (C n + , 14 ⩽ n ⩽ 27 and C n , − , 4 ⩽ n ⩽ 30), high‐mass positive‐ion carbon clusters (C n + , 60 ⩽ n ⩽ 260) and low relative molecular mass organic compounds (< 600 daltons) have been observed from the coals. It appears that the ease of C 60 +formation may be used as an indicator of coal rank. Irradiance conditions also influence the observed distribution of high‐mass positive‐ion carbon clusters. Furthermore, distributions of the high‐mass positive‐ion carbon clusters at different irradiances supports an earlier proposal that their formation is kinetically controlled.