High-mass ion fragmentation as a function of time and mass.

High-mass ion fragmentation as a function of time and mass.
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高质量离子碎裂作为时间和质量的函数。

DOI:
10.1021/ac00142a012
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发表时间:
1987
影响因子:
7.4
通讯作者:
Cotter,RJ
Cotter,RJ
中科院分区:
化学1区
文献类型:
--
作者:
Demirev,P;Olthoff,JK;Fenselau,C;Cotter,RJ

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本文研究了分子质量和离子寿命对质量范围在500-5800之间的化合物的裂解程度的影响。当采用延迟离子引出技术时,大离子在长时间内的碎裂可以被观察到作为飞行光谱中的相干峰。讨论了对未来高质量仪器设计的意义。质谱学的几个最新进展极大地扩展了(生物)有机化合物的研究范围。等离子体解吸(PD)(1)、快(KeV)原子(离子)轰击(FAB)(2)和激光解吸(LD)(3)等不稳定和热不稳定化合物的电离新技术的引入,使高达23000道尔顿的气相离子得以产生。反过来,解吸方面的进步刺激了能够处理3000道尔顿(4,5)以上离子的质量分析仪和检测器系统的发展。质谱学家在3000道尔顿以上质量范围内的初步研究表明,历史上为1000以下质量范围演变的一些概念必须重新审查,而对于更高质量范围则是如此。
The effects of molecular weight and Ion lifetimes on the extent of fragmentation observed In mass spectra of compounds In the mass range 500-5800 have been studied. Fragmentation of large Ions over long periods of time can be observed as coherent peaks In tlme-of-flight spectra when delayed Ion extraction techniques are employed. The Implications for the design of future high-mass Instruments are discussed.Several recent developments in mass spectrometry have expanded considerably the range of (bio) organiccompounds accessible for study. The introduction of new techniques for ionization of involatile and thermally labile compounds, eg plasma desorption (PD)(1), fast (keV) atom (ion) bombardment (FAB)(2), and laser desorption (LD)(3), have allowed generation of gas-phase ions with masses as high as 23000 daltons. In turn, this progress in desorption has stimulated development of mass analyzer and detector systems capable of handling ionsabove 3000 daltons (4, 5). Initial studies by mass spectroscopists in the mass range above 3000 daltons have indicated that some of the concepts evolved historically for the mass range below 1000 have to be reexaminedfor the higher mass range.
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