Momentum-to-charge ratio

Hence it can be seen that the magnetic sector separates ions according to their momentum to charge ratio. 

The magnetic sector creates a dispersion of ions according to their momentum-to-charge ratios, while the radial electric sector disperses them according to their ratios of kinetic energy-to-charge. In a one-dimensional model these results yield the following set of equations ... 

Momentum spectrum. A spectrum obtained when a beam of ions is separated according to the momentum-to-charge (m/z) ratios of the ionic species present. A magnetic-sector analyzer achieves separation of the various ionic species in this way. If the ion beam is homogeneous in translational energy, as is the case with sector instruments, separation according to the m/z ratios is also achieved. 

Magnetic analyzer A direction-focusing device that produces a magnetic field perpendicular to the direction of ion travel. All ions of a given momentum with the same mass-to-charge ratio are brought to a common focus. 

A device that assigns mass-to-charge ratios to ions based on their momentum, cyclotron freqnency, time-of-flight, or other parameters. See Kiser, R.W., Introduction to Mass Spectrometry and Its Applications, Prentice-Hall, Englewood Cliffs, NJ, 1965 Blanth, E.W., Dynamic Mass Spectrometers, Elsevier, Amsterdam, 1966 Majer, J.R., The Mass Spectrometer, Wykeham, London, 1977 Herbert, C.G. and Johnstone, R.A.W., Mass Spectrometer Basics, CRC Press, Boca Raton, EL, 2003. 

The use of MS in the detection of CBRNE threats to HLS has been gaining momentum in the last decade. MS weighs atoms and molecules according to their mass-to-charge ratios and is used to identify, characterize, and quantify compounds used in chemical, biological, radiological, or explosive threat devices [7-10]. MS, coupled to either a gas or hquid sample separation technique, is used extensively for the detection of chemical... 

Since the deflection in a magnetic field, Bp, is determined by the momentum to ionic charge ratio Bp = mv/qy the magnetic rigidity of a ion traveling in the filling gas (Oganessian et al. 2007) is... 

Mass-selective ejection of ions from the potential well is accomplished by linearly ramping the amplitude of the RF potential each ion species is ejected at a specific RF amplitude and, since the initial amplitude and ramping rate are known, the mass/charge ratio can be determined for each ion species. This method for measuring mass/charge ratios of confined ions was developed by Stafford and is known as the mass-selective axial instability mode this method made possible the commercialization of the ion trap in the early 1980s. A prerequisite is that ions be focused initially to the ion trap centre by momentum-dissipating collisions with helium atoms. 

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