Radiation produced by 20MeV electrons channeled in the crystallographic planes of quartz with and without periodic deformations

Planar channeling radiation from electrons in quartz

“…As a further example, the CR registered for the (0 111) plane at an electron energy of 32 MeV is shown in fig. 6 (see also the calculations in [6]). The two minima of the potential of this plane (fig.…”

“…Since in quartz the thermal scattering plays a dominant role for the population dynamics of the channeling states (cf. [6]) as well as for the formation of the rather large residual CR line widths (cf. [14]), their dependence on the crystal depth has temporarily been ignored in this work for the reason of a more demonstrative discussion of the main results obtained.…”

“…The quantum theory of CR influenced by USW has recently been developed in a series of publications [4,5], and new phenomena such as CR line splitting or even selective intensity amplification are theoretically predicted (see also [6]), where a strong correlation with the tuning of the frequency of USW with respect to the frequency of the CR transitions is required. Furthermore, as calculations showed, the influence of USW on CR should be fairly localised near the crystal planes [7].…”

“…The first calculations of real continuum potentials for several crystal planes of quartz, taking the specific thermal vibrations of the lattice atoms Si and O into account [8], have been published quite recently [6,9]. The wave functions and eigenvalues of relativistic electrons channeled along these planes have been found by utilizing the wellknown many-beam formalism [10].…”

“…Calculations of the spectral distribution of CR from the transition 6-5 expected under the influence of postulated ultrasonic vibrations have recently been published in [6]. As can be seen in fig.…”