نتایج جستجو برای: ion trap
تعداد نتایج: 229696 فیلتر نتایج به سال:
UNLABELLED BACKGROUND Collision induced dissociation (CID) in the triple quadrupole mass spectrometer system (QQQ) typically yields more abundant fragment ions than those produced with resonance excitation in the presence of helium gas in the ion trap mass spectrometer system (IT). Detailed product ion spectra can be obtained from one stage MS2 scan using the QQQ. In contrast, generating the...
Matrix-assisted laser desorptiodionization (MALDI) is an effective method for producing protonated peptide and protein ions in the gas phase.' Together with electrospray ionization, MALDI has become an ionization method of choice for analyzing peptides and proteins by mass spectrometry (MS).2 The analyses are usually carried out by measuring the molecular masses of the intact polypeptides or pe...
Complete phosphorylation mapping of protein kinases was successfully undertaken using an automated LC/MS/MS approach. This method uses the direct combination of triple quadrupole and ion trapping capabilities in a hybrid triple quadrupole linear ion trap to selectively identify and sequence phosphorylated peptides. In particular, the use of a precursor ion scan of m/z -79 in negative ion mode f...
Efficient collection of trapped ion fluorescence is critical for high-fidelity qubit detection and ion-photon logical interconnects in ion trap quantum information processing. The expected size of future many-ion processors place scalability requirements for high efficiency optical collection systems. We report the development and testing of a microfabricated planar ion trap with an integrated ...
Gaseous ammonia, a common toxic industrial compound, is not detected readily in ion trap mass spectrometers because its molecular ion falls below the low-mass cutoff (~m/z 40) normally used when examining organic compounds. Instead, reactions of ammonia with halobenzene radical cations were used with internal electron ionization in two cylindrical ion trap miniature mass spectrometers to create...
Ion traps like the Orbitrap are well known mass analyzers with very high resolving power. This power is achieved help of ions orbiting around an inner electrode for long time, in general up to a few seconds, since signal obtained by calculating Fourier Transform induced caused ion motion. A similar principle applied Cassinian Trap second order, where move periodic pattern in-between two electro...
A scalable, multiplexed ion trap for quantum information processing is fabricated and tested. The trap design and fabrication process are optimized for scalability to small trap size and large numbers of interconnected traps, and for integration of control electronics and optics. Multiple traps with similar designs are tested with Cd, Mg, and Sr ions at room temperature and with Sr at 6 K, with...
A method for improving the sensitivity of ion mobility measurements of ions generated from continuous ionization sources such as electrospray ionization is described. The method involves an ion trap interface between the continuous source and the pulsed experiment. The trap allows the electrosprayed ion beam to be accumulated between pulses of the mobility experiment and provides tightly focuse...
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