ISSN:
0030-493X
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
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 (Cn +, 14 ≤ n ≤ 27 and Cn, -, 4 ≤ n ≤ 30), high-mass positive-ion carbon clusters (Cn+, 60 ≤ n ≤ 260) and low relative molecular mass organic compounds (〈 600 daltons) have been observed from the coals. It appears that the ease of C60+ 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.
Additional Material:
13 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/oms.1210250703
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