有机波谱分析双语课件 (7).pdf

上传人:奉*** 文档编号:67732677 上传时间:2022-12-26 格式:PDF 页数:14 大小:1.83MB
返回 下载 相关 举报
有机波谱分析双语课件 (7).pdf_第1页
第1页 / 共14页
有机波谱分析双语课件 (7).pdf_第2页
第2页 / 共14页
点击查看更多>>
资源描述

《有机波谱分析双语课件 (7).pdf》由会员分享,可在线阅读,更多相关《有机波谱分析双语课件 (7).pdf(14页珍藏版)》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。

1、质谱仪 II 有机波谱分析 Organic Spectroscopic Analysis Mass Spectrometer II SCUEC(Li TC)2 Components of MS(III):Mass Analyzers 1.Magnetic sector 2.Quadrupole MS filter 3.Time-of-Flight 4.Ion trap analyzers 5.FT-MS 6.MS/MS(Tandem MS)MS Analyzer 3 Magnetic Sector:Double Focusing Molecular weight to 4 decimals,R

2、esolution 60,000 MS Analyzer 4 Quadrupole Mass Analyzer Uses a combination of RF and DC voltages to operate as a mass filter.Has four parallel metal rods.Lets one mass pass through at a time.MS Analyzer 5 Quadrupole Mass Analyzer+Ions scanned by varying the DC/RF voltages across the quadrupole rods

3、Compact,Inexpensive GC/MS MS Analyzer 6 Ion Trap MS Analyzer 7 Time-of-Fight(TOF)Measure the time it takes an ion to travel a specific distance.The ion is initially accelerated by a high potential 20-30kV,different mass ions will be accelerated into the analyser with initial velocities proportional

4、to their masses and subsequently arrive at the detector at different times.+Source Drift region(flight tube)detector V MS Analyzer MALDI-TOF-MS MALDI ionization,Time-of-flight Mass Spectrometer MS Analyzer 10 Fourier Transform Ion Cyclotron Resonance(FT-ICR)-Very High Precision most expensive Ion as

5、sumes a circular orbit in a B-field,frequency v/r (m/q)-1 When excited with RF with the characteristic frequency,ions absorb energy,v,but unchanged,thus r.MS Analyzer SCUEC(Li TC)11 FT-ICR MS Analyzer Resolution for the m/z 131 peak of perfluorotributylamine(PFTBA)can reach 1 million using FT-ICR.(m

6、0.00012 Da)FWHH(000,090,100012.0131mmR The resolving power decreases linearly with increasing mass,a drop to m/m=10000 can be expected for an ion of m/z 100,000.MS Analyzer SCUEC(Li TC)13 MS/MS(Tandem Mass Spectrometry)1.Ions are separated in the first MS 2.Specific ions(parent ions)pass one at a ti

7、me in a field-free collision chamber 3.Collisions with He result in Daughter Ions 4.Second MS produces mass spectrum of each parent ion in the first MS.MS Analyzer Quadrupole/Quadrupole Tandem-MS 1st Quadrupole:select specific parent ion 2nd Quadrupole(RF only,no DC):collision induced decomposition

8、3rd Quadrupole:separation spectrum of daughter ions Quadrupole-Quadupole Tandem-MS MS Analyzer 15 Features of Different Mass Analyzers m/z range resolution sensitivity Price Magnetic Sector 15,000 0.0001(double focusing)Low High Quadrupole 5,000 1 High Low Ion Trap 5,000 1 High Low Time of Flight no limit 0.0001 High FT-ICR 70,000 0.0001 High High MS Analyzer

展开阅读全文
相关资源
相关搜索

当前位置:首页 > 教育专区 > 大学资料

本站为文档C TO C交易模式,本站只提供存储空间、用户上传的文档直接被用户下载,本站只是中间服务平台,本站所有文档下载所得的收益归上传人(含作者)所有。本站仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。若文档所含内容侵犯了您的版权或隐私,请立即通知淘文阁网,我们立即给予删除!客服QQ:136780468 微信:18945177775 电话:18904686070

工信部备案号:黑ICP备15003705号© 2020-2023 www.taowenge.com 淘文阁