Channeling-radiation measurements at lawrence livermore national laboratory

The interatomic interaction potentials in radiation physics

“…Application of these arguments to the PEDM potential necessitates an increase of OD up to 573 K. However, the agreement between calculated and measured values of 1 E, will be significantly worse. On the other hand, using OD = 495 K and the DT potentials the authors of [285] obtained excellent agreement between experimental and calculated photon energies radiated by electrons, but discrepancies for positron peak energies (see Table 5) still remain (see also Table I1 in [299]). Therefore, to the author's mind, a correct revision of the Debye temperature seems to be impossible without a critical choice of the continuum potential, Similar conclusions can be made in connection with applications of the channeling radiation spectra for the determination of the channel electron density [283], using the Poisson equation Table 7 shows that the PEDM potentials lead to (4.21)…”

“…These results allow one to propose an opposite treatment of the attempt [285] concerning a more precise estimate of the Debye temperature for silicon crystals. These authors used 6, = 495 K instead of OD = 543 K in order to fit the experimental and theoretical photon energies corresponding to the 1 + 0 transitions in (11O)Si.…”

“…The axial and planar channeling radiation of electrons in diamond and silicon crystals has been observed in [283, 2841 and in [285 to 2891, respectively, while that of electronsin [288,290,2911. The planar channeling radiation in LiF has been studied in [292,2931 and for some other complex crystals and alloys in [285,294,2951. The most frequently used theoretical potentials are the Doyle-Turner (DT) approximations (3.74) and (3.75), while the Schrodinger equation (4.19) has been solved using the many-beam approximation.…”

Peculiarities of Channeling and Generated Radiation of Relativistic Electrons in the Main Charged Axes of Lithium Hydride Crystal

“…In [1,2] experimental investigations of a short wave radiation generated at the channeling of relativistic electrons with a longitudinal energy    54 MeV in main crystallographic planes (100), (110), and (111) of LiH and LiD crystals were carried out. These lightest ionic crystals with a NaCl-type structure have a number of unique characteristics [3].…”