准分子离子

化合物结构中羰基的存在似有利于化合物在正离子模式下形成准分子离子或其它分子加和离子。

The existence of carbonyl group in structure seems to be a factor that favors the formation of quasi-molecular ion ( QMI ) or other adduct molecular ion ( OAMI ) in positive mode .

质谱采用电喷雾电离源（ESI）正源，以各物质准分子离子峰选择离子监测（SIR）模式进行定量分析，血浆样品用乙腈直接沉淀处理。

The quantitation was done by selected ion recording ( SIR ) mode of electrospray ionization , with chlorimipramine as internal standard . Plasma was deposited by acetonitrile directly .

准分子离子Kr~+Li的真空紫外发射及其电子束激发动力学

Vacuum-ultraviolet Emission of Ionic Excimer Kr ~ + Li and Excitation Dynamics by Relativistic e-beam Pumping

根据分析信号与随机噪声的质量色谱峰宽度不同，通过滤除质谱中的随机噪声，较为准确地得到化合物分子离子或准分子离子的信息，可显著地改善定性分析的准确性。

It is based on the assumption that analytical signals differ from random noise in the chromatographic peak width . The information of the molecular ion or pseudo-molecular ion about the analytes can be obtained .

实验表明，负离子模式下，山茛菪碱季铵正离子与两个氯离子结合形成[M+35]-准分子离子峰，并在二级质谱中生成失去一氯甲烷或苄基氯的离子。

The results indicated that anisodamine derivatives modified by benzyl , the quaternary ammonium chloride , could form a molecular-related ion [ M + 35 ] - and producted ions through elimination of methyl chloride or benzyl chloride in spectra of negative ion mode .