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小木虫论坛-学术科研互动平台 » 化学化工区 » 分析 » Mass defect是什么意思?
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chaonan321

金虫 (小有名气)

[交流] Mass defect是什么意思?

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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1楼 2008-03-12 21:52:58
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pegasusm

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应该是不同离子的质量亏损是不一样的，所以你设置的小数点后位数越多，分辨率就越高，这也就是现在所谓的高分辨质谱吧，很多人用这个来代替做元素分析。
TOF可以做到10ppm以下级别的误差。
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7楼2008-03-13 22:53:24
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chaonan321

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没人理我,好着急啊,实在是不太懂:'(
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2楼2008-03-13 08:34:13
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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。
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3楼2008-03-13 08:54:44
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agilent

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字面解释为质量亏损
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4楼2008-03-13 08:59:02
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