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- The results shows the molecular ion peak m/z 364[M+H]+, m/z156, were detected by ESI-MS; m/z363[M]+ and m/z138,m/z181 and m/z154, m/z221 were detected by EI-MS. 用ESI-MS获得m/z364[M+H]+、m/z156等质谱峰,用EI-MS获得m/z363[M]+、m/z138、m/z181、m/z154、m/z221等质谱峰,并解释了其中的主要特征碎片离子。
- The results showed that the molecular ion peak of Aris A A is rather strong in the mass spectrum,the detection limit is 5 ng(signal to noise ratio=10). The sensitivity is high enough to determine Aris A A in CTPM. 测定结果表明;马兜铃酸A的质谱有较强的分子离子峰;最低检测限为5 ng(信噪比等于10);可以满足对中成药中马兜铃酸A测定之要求.
- Some thermo-unstable or nonvolayile nitrocompounds were analyzed by DEI-MS and signi-ficant molecular ion peak was obtained, and structural information was offered by fragment ions. 采用DEI-MS技术分析了一些热不稳定难于气化的硝基化合物,得到了明显的分子离子峰,并由碎片峰提供结构信息。
- Keywords BDP;intermediates;molecular ion peaks;mass spectrometry; 溴莫普林;中间体;分子离子峰碎片;质谱;
- molecular ion peak 分子离子峰
- The results from the P.Graham and Castleman's study on CH3I also supported this conclusionIn the mass spectra ,the parent ion peak was clearly recorded . Graham等人及Castleman等人在790nm左右飞秒激光系统下也分别对碘甲烷分子进行了研究，都认为碘甲烷分子先电离然后解离。
- Mass specta of N-Benzylidene-1-methoxy-1-propylamine have been discussed,Logical loss of molecular ion was deduced. ? 讨论了1－甲氧基－N－（芳甲叉基）－1－丙胺类化合物的质谱，分析了主要碎片离子的产生过程，推测了该类化合物的裂分规律。
- Abstract The decomposition reaction of molecular ion of phenol and phenylmethylether had been stuied by molecular orbitals theory. 摘要 本文利用分子轨道理论计算方法研究苯酚和苯甲醚分子离子分解反应，计算了分解反应中的前体离子、碎片离子和碎片的电离电位和内能。
- Several organic peroxides have been split at appropriate conditions by which mass spectra graph with molecular ion has been made. 在高真空、缓慢进样的条件下，对这几种有机过氧化物进行质谱裂解，可得到带分子、离子的质谱图。
- During the growth period,the N 2 O emission reached the maximum value during booting period,and the emiss ion peak value was advance date. At the later period of t he growth,the N 2 O emission was weak,and the peak valu e was delayed. 小麦生育期耕作层土壤N2O排放以孕穗期最大,且排放峰值提前,而小麦生长后期(开花期和成熟期),N2O排放出现低谷,且峰值推后,反应物以土壤氮为主。
- 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. 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 fayors the formation of quasi-molecular ion (QMI) or other adduct molecular ion (OAMI) in positive mode. 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凖分子离子或其他分子加和离子。
- No Sample fragments are found in negative ESI process, but a lot of fragments are almost presented in FAB process. Comparing these spectra, the fragments or molecular ion can be distinguished. 试样在负离子电喷雾电离（ESI）过程中不产生碎 片峰，但是在FAB过程中产生许多碎片，比较这些谱图，就可以区别碎片峰和分子离子峰。
- Adduct ions [M+NH_4]~+, protonated molecular ion [M+H]~+ and molecularion [M]~+. 观察到较高强度的加合离子[M+NH_4]~+、质子化分子离子[M+H]~+和分子离子[M]?
- An intense sodium adduct appeared in their FABmass spectra, which was more abundant than the corresponding protonated molecular ion[M+H]~+ and may give more difinite information about molecular weight of the sample. 结果表明:在FAB谱中[M+Na]~+加合离子的丰度要比[M+H]~+离子高得多。
- No sample fragments are found in negative ESI process, but a lot of fragments are almost presented in FAB process.Comparing these spectra,the fragments or molecular ion can be distinguished. 试样在负离子电喷雾电离（ESI）过程中不产生碎片峰，但是在FAB过程中产生许多碎片，比较这些谱图，就可以区别碎片峰和分子离子峰。
- The 1 - Nand 2 - N tautomers can be distinguished conveniently from whether the ion peaks of [ M - 29 ] + and [M -57]+ are rich or not. 根据其MS谱图中[M-29]~+及[M-57]~+峰的强度;可以方便地区分1-N和2-N烷基化产物.
- Some of the molecular ions fragment into smaller daughter ions and neutral fragments. 有些分子离子断裂成为较小的子离子和中性碎片。
- The results show the EIMS and CIMS of this type compound all have many ion peaks produced through skeleton rearrangements. 结果表明,无论是EIMS,还是CIMS均存在较多的骨架重排离子峰;
- The samples were dissolved in dimethyl sulfoxide (DMSO) and the data were recorded by positive ion mode.No any other fragment was found except for little molecular ion which loses a chlorine atom. 样品溶解在二甲基亚砜中，以正离子方式记录谱图，结果发现除产生一个失去氯原子的分子离子峰外，没有任何碎片峰。
