Biddulph Gregory X, Piwowar Alan M, Fletcher John S, Lockyer Nicholas P, Vickerman John C
Manchester Interdisciplinary Biocentre, University of Manchester, Manchester, M1 7DN, UK.
Anal Chem. 2007 Oct 1;79(19):7259-66. doi: 10.1021/ac071442x. Epub 2007 Sep 7.
C84+ and coronene (C24H12+) have been studied as primary ions for use in secondary ion mass spectrometry. A representative range of samples has been used to compare the effectiveness of each primary ion with the existing C60+, Au+, and Au3+ primary ions. It was found that C84 is the most effective primary ion providing higher secondary ion yields and a high molecular to fragment ion ratio. Coronene had a performance similar to C60. Coronene and C60 primary ions were also used to extend a previous study of matrix suppression/enhancement effects. The C60 was found to ameliorate this effect, possibly due to the increase in protonation in polyatomic sputtering, and coronene was found to further reduce suppression showing evidence of a chemical effect.
C84+和蔻（C24H12+）已被作为二次离子质谱中使用的一次离子进行了研究。使用了一系列具有代表性的样品来比较每种一次离子与现有的C60+、Au+和Au3+一次离子的有效性。结果发现，C84是最有效的一次离子，能提供更高的二次离子产率和高分子离子与碎片离子比。蔻的性能与C60相似。蔻和C60一次离子还被用于扩展先前关于基质抑制/增强效应的研究。发现C60能改善这种效应，这可能是由于多原子溅射中质子化增加所致，并且发现蔻能进一步减少抑制，显示出化学效应的证据。
