Ae -codimension of germs of analytic curves by Hernandes M. E.

By Hernandes M. E.

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The C-trap fragmentation resembles the collision-cell CID more than it resembles the ion-trap–CID. Subsequently, separate higher-energy RF-only collision octapoles (higher-energy collision-induced dissociation, HCD) were mounted on LIT–orbitrap hybrid systems to make optimum use of this feature. Such a system can be considered a gas-phase ion-chemistry laboratory on its own, featuring different ways to perform fragmentation, that is, ion-trap CID, HCD, and eventually ETD, as well as different ways to measure the m/z values of the resulting ions, that is, by unit-mass resolution with the ion trap or by ultra-high resolution with the orbitrap.

Ions with mass m and z elementary charges e are accelerated with a voltage V into a magnetic field B with a path with a radius of curvature r. One can derive the equation m∕z = B2 r2 e∕2V , which indicates that the separation of ions with different m/z can be achieved in three different ways: by variation of the radius of curvature ions with different m/z are separated in space, while by variation of either B or V ions of different m/z are separated in time, that is, they can be detected one after another by a single-point detector at a fixed position behind a slit [44].

Whereas the conventional drift-tube approach has been the first way to perform ion mobility in combination with MS, drift-tube IMS–MS systems have become commercially available only very recently (2014).

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