نتایج جستجو برای: mass spectrometer source
تعداد نتایج: 885953 فیلتر نتایج به سال:
Comets have been considered to be representative of icy planetesimals that may have contributed a significant fraction of the volatile inventory of the terrestrial planets. For example, comets must have brought some water to Earth. However, the magnitude of their contribution is still debated. We report the detection of argon and its relation to the water abundance in the Jupiter family comet 6...
UHPLC/MS analyses of morphine and 3 of its metabolites (normorphine, morphine3-b-D-glucuronide [M3G], and morphine-6-b-D-glucuronide [M6G]) are used to compare mass spectrometer sensitivity with reversed-phase liquid chromatography (RPLC) and hydrophilic interaction chromatography (HILIC). Two Agilent ZORBAX Rapid Resolution High Definition (RRHD) columns are used in this comparison, an Agilent...
Chemical reaction of small silicon cluster ions (Si n: 20 ≤ n ≤ 29) with nitric oxide was studied by using the FT-ICR (Fourier Transform Ion Cyclotron Resonance) mass spectrometer. Silicon clusters were generated by a pulsed laser-vaporization supersonic-expansion cluster beam source directly connected to the FT-ICR mass spectrometer. Injected and size selected clusters were thermalized to the ...
Continuous analysis of oxygen and carbon dioxide tension in the blood phase, over periods of 4-5 h, was carried out in the pulmonary artery (93 determinations in six anesthetized dogs) and in the aorta (29 determinations in four anaesthetized dogs). Silastic-covered stainless steel catheters attached to a mass spectrometer were used. The mass spectrometer signals were linearly related to the bl...
The ratio of CH4/CO in comets is an important indicator of the region of their formation. However, it is diicult to measure the quantity of CH4. The Giotto Ion Mass Spectrometer experiment observed a quantity of CH + which seemed inconsistent with the amount of CH4 observed. Thus, it was proposed that a source of the CH + was a distributed source in the dust. We tested this hypothesis by observ...
Coupling capillary electrophoresis to mass spectrometers through the Agilent triple tube coaxial sheath-fl ow sprayer is a widely used confi guration due to its simplicity, versatility, and robustness. This Technical Overview shows that with the Jet Stream source and the latest version of the CE/MS sprayer, this approach can now also be used in combination with the proprietary Agilent Jet Strea...
Paper Spray Ionization is an atmospheric pressure ionization technique that utilizes an offline electro-osmotic flow to generate ions off a paper medium. This technique can be performed on a Bruker SolariX Fourier transform ion cyclotron resonance mass spectrometer by modifying the existing nanospray source. High-resolution paper spray spectra were obtained for both organic and biological sampl...
The use of novel mass spectrometric techniques, off-line coupled to chromatographic techniques is described in order to obtain molecular mass information of compounds present in complex mixtures of oligosaccharides. Such information could be quite useful in studies where pure and well-defined enzymes are used to study the chemical fine structure of polysaccharides. Post source decay fragmentati...
Mass spectrometry for fundamental studies in metrology and atomic, nuclear and particle physics requires extreme sensitivity and efficiency as well as ultimate resolving power and accuracy. An overview will be given on the global status of high-accuracy mass spectrometry for fundamental physics and metrology. Three quite different examples of modern mass spectrometric experiments in physics are...
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