(2)Molecules with even N have even molecular ion mass and molecules with odd N have odd molecular ion mass;(3)That is to say, if the mass is an even number, the compound contains no nitrogen or an even number of nitrogens. It the mass is an odd number, the compound contains an ...
分子离子 molecular ion 准分子离子 quasimolecular ion 质谱图mass spectrum 半峰高处的全峰宽 Full width half Maximum, FWHM 波谷valley 分辨率 R = m/△m ,at 5 % valley 总离子流图 total ion chromatography ,TIC 萃取离子流图 extracted ion chromatography,EIC 子离子检测模式 Daughter( Product ) ion s...
精度:质量测定的精确程度精度:质量测定的精确程度 2.1.8 质谱术语及质谱中的离子质谱术语及质谱中的离子()质谱图与质谱表()质谱图与质谱表(二)(二)离子的主要类型离子的主要类型1.分子离子分子离子(molecular ionmolecular ion) 由样品分子电离而产生的,标为由样品分子电离而产生的,标为 ,“+”+”表示有机物...
分子离子（molecular ion）：样品分子失去一个或多个电子后的离子形式。准分子离子（quasimolecular ion）：在离子化过程中保留部分分子结构的离子。质谱图（mass spectrum）：表示样品中离子m/z与强度关系的图表。半峰高处的全峰宽（Full width half Maximum，FWHM）：表示峰形状的参数，用于描述峰的宽度。
is the same as the mass of the molecular ion. However, when larger molecules such as proteins or peptides aremeasured, they typically carry multiple ionic charges and therefore thezvalue is an integer greater than 1. In these cases them/zvalue will be a fraction of the mass of the ion...
MOLAR MASS就是23.0gmol^-1... 1 MOLE的OXYGEN GAS的质量则用RELATIVE MOLECULAR MASS来表达 因为OXYGEN GAS是SIMPLE MOLECULAR STRUCTURE OXYGEN GAS的MOLECULE就是由两粒OXYGEN ATOM组成 所以OXYGEN GAS的RELATIVE MOLECULAR MASS就是16.0X2 即是32.0... 1 MOLE的SODIUM CHLORIDE的质量就用FORMULAR ...
Low mass describes the range where individual isotopic contributions to the overall molecular ion signal can be resolved as separate peaks. This is 1–2 kDa for a quadrupole of modest performance, perhaps 5 kDa for a high performance MALDI-TOF or ESI orthogonal-acceleration TOF, and significantly...
(cosine similarity >0.7) and a delta parent ion mass of ±0.02 Da with MS/MS spectra present in GF animals were removed. Spectral pairs information was contained in a networkedges_selfloop file. All the MS/MS spectra were then run in batch using a custom Python script of microbeMASS...
Ion mobility separates gas phase ions in the presence of an electric field based on their mobility through an inert buffer gas. The separation is a function of the shape, charge, and size of the ionized peptide (Jiang, Chung, May, McLean, & Robinson, 2019). Recently, ion mobility has ...
The most commonly used method for the identification and quantification of contaminants is SRM or MRM. For this scan mode, both quadrupoles are focused on selected masses. In the first quadrupole, usually the protonated or deprotonated molecular ion is selected and fragmented in quadrupole Q2 by ...