نتایج جستجو برای: ion cyclotron resonance apoptosis
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Petroporphyrins, geoporphyrins, or metalloporphyrins are the original petroleum biomarkers, identified by Alfred Treibs more than a century ago and first molecular evidence for biogenic origins of petroleum. Since discovery, analytical strategies have been developed to identify porphyrins in its fractions. This review focuses on advances enabled ultrahigh resolving power Fourier transform ion c...
measurements of ion cyclotron range of frequency minority-heated fast-ion distributions on Alcator C-Mod. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. ICRH (Ion Cyclotron Resonance Heating) is the primary auxiliary heating on the Alcator C-Mod tokamak and is commonly used on other devices, and is planned for use on ITER. ...
Electron transfer through gas phase ion-ion reactions has led to the widespread application of electron- based techniques once only capable in ion trapping mass spectrometers. Although any mass analyzer can in theory be coupled to an ion-ion reaction device (typically a 3-D ion trap), some systems of interest exceed the capabilities of most mass spectrometers. This case is particularly true in ...
Electrospray ionization coupled with Fourier transform ion cyclotron resonance (FTICR) mass spectrometry has been used to provide information about complete combinatorial libraries of small peptides containing 10(3)-10(4) components. The fidelity of attempted synthesis steps can be ascertained rapidly, and, when the extremely high resolution FTICR mass spectra are combined with appropriate comp...
A new type of pulse chopper called an Einzel lens chopper is described. An Einzel lens placed immediately after an electron cyclotron resonance ion source is driven by high-voltage pulses generated by a newly developed solid-state Marx generator. A rectangular negative barrier pulse-voltage is controlled in time, and the barrier pulse is turned on only when a beam pulse is required. The results...
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