碎片峰

而质谱关键碎片峰m/z247是否出现则是区分厚朴酚与和厚朴酚的质谱典型特征。

But the presence or absence of the key fragment peak at m / z 247 is the typical characteristic of the mass spectra to differentiate the chemical structures between magnolol and honokiol .

对其H和C进行了完全地归属，并根据MS的相关碎片峰，提出了其可能的裂解途径机理。

C and H of it were elucidated in detail and possible cleavage pathway was brought forward according to the main MS fragment ions .

通过红外谱图的分析，降解之后谱图中C-N键的吸收峰消失，并且在而且出现了很多的碎片峰。

In the IR spectrum after being degraded , C-N absorption peak disappeared , in addition fragment peaks appeared .

此外，还给出了丰富的碎片峰；小分子药物的结构与CID电压对APCI/MS的分子离子峰及碎片离子丰度有明确的影响。

In APCI / MS the structures of small molecular drugs and CID voltage affected their molecular ion peaks and fragment ion peaks obviously .

结果表明，经分子蒸馏后的馏分中，脂肪酸得到了有效富集，GC-MS分析中杂质碎片峰干扰小，总含量高达84.12%。

It was indicated that the fatty acids are concentrated efficiently with the total content of 84.21 % by molecular distillation , meanwhile the fragment peek of impurities have fewer interference by assayed GC-MS.

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。

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 .

根据所得到的有关相对分子质量以及碎片峰的信息，对乙酰吉他霉素各组分及其水解产物的结构进行了鉴别。

The components were identified according to the molecular weight and its major mass fragment ions .

滚滑复合轴承研究其质谱的分子离子峰及特征碎片峰也与熊果酸的一致。确定该化合物为熊果酸。

Research on Compound Bearing of Sliding and Rolling So it was determined that the compound was ursolic acid .

苯的飞秒质谱图与纳秒情况不同，分子离子为主，碎片峰很少。

Different from that of nanosecond , benzene phtoionization using femtosecond laser has predominent molecular ion peak with very small percentage of fragments .

IBA和JA的标准试剂显示了相同的质谱图形变化，在60V时能得到最强分子离子峰，当电压继续升高时分子离子峰的强度逐渐减弱，并出现一些m/z更小的碎片离子峰。

Both IBA and JA standard chemicals showed almost same changes of mass spectrum pattern . Optimum drift voltage for most intensity was 60 V , as drift voltage increased , the intensity of molecular ion peak decreased and the fragment ion peaks shifted to smaller m / z one .

仪器采用了软电离方式，避免了碎片离子峰的形成，便于对污染环境中挥发性有机物的解析。

A VUV soft ionization source was adopted in the mass spectrometer , which can avoid the formation of fragment ions and analyze volatile organic compounds in ambient air without pre-separation .

用同步辐射研究苯基氰分子的单光子电离与碎解，精确地测量它的电离势、在不同的飞行时间产生的自发的和亚稳态碎片离子的出峰电势（appearancepotential）。

Single photon ionization and fragmentation of benzonitrile is studied using synchrotron radiation . The ionization potential of benzonitrile , and the appearance potentials of spontaneous or prompt and metastable fragment ions for different flight time are measured precisely .