Affiliation:
1. National Polytechnic University of Armenia
Abstract
The well-known Laue condition determining the intensity maximums of diffracted on
an ideal crystal structure plane wave is discussed. It is proved that the Laue conditions, which are
restrictions imposed on the values of the scattering wave vector, is more correctly to be considered
as a pair of two conditions. The first conditions relate to the wave vector of an incident wave and
the second conditions relate to the wave vector of an observation direction. In other words, to
observe the maximums, it is not enough that only the difference (the scattering wave vector) of
these two vectors satisfies the Laue condition. To observe the maximums, it is necessary that each
of these vectors separately, i.e. the wave vector of the incident wave and the wave vector of the
observation direction, satisfy the Laue condition. It is shown that such a doubling of the
maximums conditions leads to a decrease in the number of observed maximums compared to the
condition imposed only on the scattering wave vector.
Publisher
National Academy of Sciences of the Republic of Armenia