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亚稳峰
相关语句
  metastable peak
     SEARCHING OF THE ORIGIN OF METASTABLE PEAK IN MASS SPECTRA BY COMPUTER
     质谱中亚稳峰来源的计算机检索
短句来源
     In the present paper an energy filter grid fixed behind collection slit ofthe Type LT-1A IMMA has been described. Utilizing this grid to eliminatethe interference of metastable peak and reduce the background noise level, agreat improvement on the sensitivity is realized.
     本文描述了在LT-IA型离子探针质谱微分析仪(IMMA)接收缝后面安装一个能量过滤栅,能量大于eUg(Ug是栅网电压)的离子通过栅网,能量小于eU_g的离子被反射掉,从而消除了亚稳峰的干扰,降低了本底噪声,显著提高了LT-1A型IMMA的灵敏度。
短句来源
  相似匹配句对
     Interference Peak in Metastable Ion Spectra
     亚稳离子谱中的干扰
短句来源
     SEARCHING OF THE ORIGIN OF METASTABLE PEAK IN MASS SPECTRA BY COMPUTER
     质谱中亚稳来源的计算机检索
短句来源
     In addition,there also exist C=C vibra tion peak as the result of the de-hydrogen chloride reaction.
     C振动
短句来源
     The Peak Type of Tailed Peak
     拖尾的类型
短句来源
     METASTABLE CHARACTERISTICS OFβ-W
     β-钨的亚稳性质
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In this report the electron impact (EI) and chemical ionization (CI) mass spectra of xylo-oligosaccharide poracetates, from β-xylose tetra-acetato (1) up to β-1→4 xylohexaose tetradecaacetate(6) were described. 1~6 were purified by HPLC and the mass spectra of which wore measured on a JMS-D300S mass spectrometer with a JMA-2000 data systom using tho direct insertion probe.

本文报道了全乙酰化木糖(1)~木六糖(6)的电子轰击质谱(70eV,20eV)及化学电离(反应气体CH_4,i-C_4H_(10),NH_3)质谱的研究结果.根据亚稳峰及高分辨测定资料,阐述了木糖全乙酰化物的碎裂途径,讨论了木二糖~木六糖全乙酰化物的碎裂机理,指出了低聚木糖质谱的特征碎片离子.在所研究的电子轰击质谱中均未观察到分子离子,只有以NH_3为反应气体的化学电离质谱才获得准分子离子,其中全乙酰化木糖(1)~木三糖(3)的[M+NH_4]~+为基峰,而全乙酰化木四糖(4)~木六糖(6)的[M+NH_4]~+离子强度较弱。

In the present paper an energy filter grid fixed behind collection slit ofthe Type LT-1A IMMA has been described. Utilizing this grid to eliminatethe interference of metastable peak and reduce the background noise level, agreat improvement on the sensitivity is realized.

本文描述了在LT-IA型离子探针质谱微分析仪(IMMA)接收缝后面安装一个能量过滤栅,能量大于eUg(Ug是栅网电压)的离子通过栅网,能量小于eU_g的离子被反射掉,从而消除了亚稳峰的干扰,降低了本底噪声,显著提高了LT-1A型IMMA的灵敏度。

The mechanism of unimolecular ion dccomposition reaction of acetamliide and p-aminoasetophenone has been studied from both the experimental and the theoretical aspects. Ex-perimentally metastahle peaks were determmed by lined scan of magnetnc field and electrostaticfield in mass spectrometer. Decomposition pathway of the two compounds in mass spectrometerwas obtained theoretically, on the basis of molecular orbital theory, ab initio calculations with the3-2l basis sets hate been used to investigate the variations...

The mechanism of unimolecular ion dccomposition reaction of acetamliide and p-aminoasetophenone has been studied from both the experimental and the theoretical aspects. Ex-perimentally metastahle peaks were determmed by lined scan of magnetnc field and electrostaticfield in mass spectrometer. Decomposition pathway of the two compounds in mass spectrometerwas obtained theoretically, on the basis of molecular orbital theory, ab initio calculations with the3-2l basis sets hate been used to investigate the variations of energy in reactions. Total energydifference (△E) between parent ion and decomposition product was obtained hy calculation. Ac-cording to the principle of the stability of product and of favourable energy, the reaction of least'△E is dominat in the competitive decomposition reactions. Calculated result and that, of analysisby mass spectrometry are in aggrement.

从实验和理论两方面对乙酰苯胶和对氨基苯乙酮单分子离子分解反应机理进行研究.在实验方面,采用质谱仪器的磁场/静电场联动扫描检测了两个化合物的亚稳峰,得到化合物在质谱中的分解途径.在理论方面,根据分子轨道理论,用3-21基组从头计算研究分解反应中的能量变化.获得了分解产物的总能量与前体离子的总能量之差△E,按照产物的稳定性和能量有利的原则,在竞争的分解反应中,△E最小的分解反应占优势.计算的结果与质谱实际分析的结果一致.

 
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