Crossed electric and magnetic fields

Dunkle notes (Ref 15) that one of the recent works described a deceleration of the detonation wave in oxy-acetylene mixtures by crossed electric and magnetic fields, which makes an interesting comparison with the acceleration of the shock wave in argon electrically as reported by R.M. Parrick ... 

Figure 1. (The color version is available from the authors.) The trajectory of an electron ionizing under the influence of crossed electric and magnetic fields [18,21]. The line passing through the saddle point shows the projection of the conventional transition state, which is a vertical plane. Of course the trajectory can cross this plane many times. We cannot display our true TS, which is a complicated four-dimensional object, but we note that it is intersected only once, namely at the dot. The right-hand panels show the same trajectory in the three normal-form coordinates (see Section F).

The Hydrogen Atom in Crossed Electric and Magnetic Fields. 37... 

This motion of a charged particle is usually referred to as the drift in crossed electric and magnetic fields. Direction and velocity of the drift are the same for electrons and ions. Thus, the entire plasma can move as a whole with the drift velocity as a whole, which is applied in plasma centrifuges. 

Crossed electric and magnetic fields have been used for mass analysis in several mass spectrometers but do not have wide application despite their perfect double focusing. The first cycloidal mass spectrometer was constructed in 1938 by Bleakney and Hippie A commercial instrument... 

A surface beam is contaminated with other particles, especially positrons. Due to their lower mass the positrons are much faster than the muons at a fixed momentum. They are filtered out of the beam by a velocity separator using crossed electric and magnetic fields. 

Until now detailed experiments on Rydberg atoms in crossed electric and magnetic fields have been performed on alkali atoms [568] and on Rydberg states of the H atom [573], which are excited either by direct two-photon transitions or by stepwise excitation via the 2 p state. Since the ionization energy of H is 13.6 eV, one needs photon energies above 6.7 eV (1 < 190 nm), which can be produced by frequency doubling of UV lasers in gases or metal vapors [574, 575]. 

G. Raithel, M. Fauth, H. Walther, Quasi-Landau resonances in the spectra of rubidium Rydberg atoms in crossed electric and magnetic fields. Phys. Rev. A 44, 1898 (1991)... 

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