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Mass defect是什么意思?
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各位哥哥姐姐好,我想请教一个问题 TOF/MS中Mass defect参数是什么意思呢?应该怎么设置呢 [search]Mass defect[/search] |
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dnp(金币+1,VIP+0):哈哈，谢谢你的翻译……
dnp(金币+1,VIP+0):哈哈，谢谢你的翻译……
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这段话是讲质谱的检测器是怎么工作的。第一段话，是说检测器是可以在同一时间检测很多离子。这些离子由离子源产生，到达检测器就变成一些其它的信号，最后就是我们看到的全离子谱图。但是said signal呢就是提取离子色谱图，你把said signal这个功能打开后就只对你指定的离子进行采集。 第二段话就是说你所看到的谱图峰的出峰时间是随着离子到达检测器的变化而变化的。 第三段话就是说离子到达检测器的时间和你在电脑上看到色谱峰的时间有时间差，我觉得那个mass defect detector可能就是量度你的时间差的一个检测器。 |
5楼2008-03-13 11:20:12
2楼2008-03-13 08:34:13
dnp
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%r- Apparatus for detecting a plurality of ion peaks within at least one transient" in time of flight mass spectrometry, said transient being generated in response to an ion source extraction pulse, said apparatus comprising: signal detector means responsive to said ion peaks for detecting/each of said ion peaks and generating an output signal indicative of the intensity of each of said ion peaks; means for turning on said signal detector means only for a data collection time window beginning just prior to an expected arrival time of each said ion peak; and means for processing said ion peaks to generate a mass spectrum file indicative of intensities of said ion peaks. 2. The apparatus of claim 1 , further comprising mass defect detector means for monitoring an actual arrival time for each said ion peak at said signal detector means and causing said data collection time window to be shifted in accordance with said actual arrival time of each said ion peak such that each said ion peak falls within an approximate center of said data collection time window. 3. The apparatus of claim 2, wherein said mass defect detector means comprises a plurality of delta-mass tables, each said table containing a plurality of time delay values for causing said signal detector means to be turned on at times slightly prior to said expected time of arrival of each said ion peak depending on a mass defect of said ion peak, to thereby cause each said data collection time window to be shifted such that each said ion peak falls completely within one of said data collection time windows. 摘自：http://www.wipo.int/pctdb/en/wo.jsp?WO=1995%2F00236&IA=WO1995%2F00236&DISPLAY=CLAIMS TOF/MS我也不是很大懂，这个大致意思应该是设定一个值，使离子在这个值所设定范围内能够被检测器所检测到。 |
3楼2008-03-13 08:54:44
agilent
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4楼2008-03-13 08:59:02
