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The probability of emission of photons in non-dipole case by channeledparticle is calculated. The emission of hard photons with an energy comparableto the energy of the incident channeled particle is examined. The calculationof the quasi-Bloch energy spectrum of the oriented fast charged particleentering the crystal at an angle substantially greater than the Lindhard angleis performed. The initial and final spectra of the channeled particle belongingto a different set of band wave functions corresponding to different energiesare used. The processes of the photon generation by the quantumcrystal-oriented particle entering into the crystal at an angle both greaterand smaller than the Lindhard angle are considered on the equal footing. It isshown that the spectrum of hard photon emission consists of a set of thewell-observed emission lines. The probability of the nondipole photon radiationby the channeled particle with the energy within a small solid angle orientedalong the propagation direction of the channeling particle is shown to be equalto It has been shown that the nondipole processes of the radiation of hardphotons by the channeled particles are well observed experimentally.

The manifestation of the band structure in the photon emission spectrum of the fast above-barrier oriented particle