Kossel Lines and X-ray Localized Conical Modes

An alternative way of describing X-ray Kossel lines based on the theory of X-ray localized conical modes existing in perfect crystals is proposed. The theory of Kossel lines is presented within the approximation of a two-wave dynamical diffraction theory. The theoretical results are compared with known experimental data and demonstrate good general agreement with an experiment. The influence of essential crystal parameters (perfection, size, Borrmann effect, etc.) on the shape of Kossel lines is discussed. To prove the direct link between Kossel lines and X-ray localized conical modes, it is proposed to use an X-ray time-delay detection technique.