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- Some of the molecular ions fragment into smaller daughter ions and neutral fragments. 有些分子離子斷裂成為較小的子離子和中性碎片。
- Studies on the potential energy curves of homonuclear diatomic molecular ions using energy consistent method[J]. 引用該論文 陳紅麗;孫衛國;劉國躍;劉一丁;馮灝.
- Adduct ions [M+NH_4]~+, protonated molecular ion [M+H]~+ and molecularion [M]~+. 觀察到較高強度的加合離子[M+NH_4]~+、質子化分子離子[M+H]~+和分子離子[M]?
- Electrospray ionization mass spectrometry(ESI- MS) is a soft ionization technique by which molecular ions are mainly formed. 電噴霧質譜（ESI - MS）技術是一種軟電離技術，其中主要是分子離子形成。
- Mass specta of N-Benzylidene-1-methoxy-1-propylamine have been discussed,Logical loss of molecular ion was deduced. ? 討論了1－甲氧基－N－（芳甲叉基）－1－丙胺類化合物的質譜，分析了主要碎片離子的產生過程，推測了該類化合物的裂分規律。
- Much structure information is obtained on the base of the molecular ion MH+,the additive ions [M+ 73]+ and the pyrrolic fragment ions. 通過分子離子MH+，加合離子（M十73）+，以及吡咯環碎片離子可獲得豐富的結構信息。
- Abstract The decomposition reaction of molecular ion of phenol and phenylmethylether had been stuied by molecular orbitals theory. 摘要 本文利用分子軌道理論計算方法研究苯酚和苯甲醚分子離子分解反應，計算了分解反應中的前體離子、碎片離子和碎片的電離電位和內能。
- Several organic peroxides have been split at appropriate conditions by which mass spectra graph with molecular ion has been made. 在高真空、緩慢進樣的條件下，對這幾種有機過氧化物進行質譜裂解，可得到帶分子、離子的質譜圖。
- 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獲得m/z364[M+H]+、m/z156等質譜峰,用EI-MS獲得m/z363[M]+、m/z138、m/z181、m/z154、m/z221等質譜峰,並解釋了其中的主要特徵碎片離子。
- 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. 化合物結構中羰基的存在似有利於化合物在正離子模式下形成準分子離子或其它分子加和離子。
- 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. 化合物結構中羰基的存在似有利於化合物在正離子模式下形成凖分子離子或其他分子加和離子。
- Using polyethylene glycol(PEG) as internal reference, electrospray ionization(ESI)/time - of -flight mass spectrometry(TOF - MS) was developed to determine the accurate mass of the protonated molecular ions of five erythromycin analogue antibiotics. 研究了聚乙二醇(PEG)為內標物的電噴霧(ESI)/飛行時間質譜(TOF-MS)準確質量測定方法;並應用於5個紅霉素類抗生素質子化分子離子(MH~+)的質量測定.
- With the theory of electron-molecule scattering, we have investigated the scat-tering and energy loss for slow diatomic molecular ions in electron gases in solidsand discussed the influence of the coherence effects between two ions to the energyloss. 利用量子力學中的電子分子散射理論，研究了低速雙原子分子離子在固體電子氣中的散射與能量損失，重點討論了兩離子之間的干擾效應對能量損失的影響。
- 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. 採用DEI-MS技術分析了一些熱不穩定難於氣化的硝基化合物,得到了明顯的分子離子峰,並由碎片峰提供結構信息。
- 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. 試樣在負離子電噴霧電離（ESI）過程中不產生碎 片峰，但是在FAB過程中產生許多碎片，比較這些譜圖，就可以區別碎片峰和分子離子峰。
- 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. 測定結果表明;馬兜鈴酸A的質譜有較強的分子離子峰;最低檢測限為5 ng(信噪比等於10);可以滿足對中成藥中馬兜鈴酸A測定之要求.
- 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. 結果表明:在FAB譜中[M+Na]~+加合離子的丰度要比[M+H]~+離子高得多。
- 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. 試樣在負離子電噴霧電離（ESI）過程中不產生碎片峰，但是在FAB過程中產生許多碎片，比較這些譜圖，就可以區別碎片峰和分子離子峰。
- 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. 樣品溶解在二甲基亞碸中，以正離子方式記錄譜圖，結果發現除產生一個失去氯原子的分子離子峰外，沒有任何碎片峰。
- The two different ionization techniques are complementary as more ion fragmentation information can be obtained from the EI mode while more molecular ion information from the NCI mode. 通過對兩種離子源技術的對比研究發現,EI方法能夠提供更多的碎片和結構信息,NCI方法能提供分子離子(相對分子質量)信息,兩種信息互補,可提高定性的可靠度。
