Abstract
A method of measuring the incidence angle beta and azimuth angle phi in LEED experiments is proposed. The sample is positioned in such a manner that, after rotation through the angle delta around the axis parallel to the sample surface, the (hk) beam occupies the place on the luminescent screen occupied by the (00) beam before this rotation. If the basic vectors of the surface structure are known, the angle beta can be calculated using the angle delta and electron energy E. The angle phi is also known because the projection of the primary beam on the sample surface is parallel to the vector (hk) of the two-dimensional reciprocal lattice. The sources of error are discussed and the total error in single measurement of both beta and delta is estimated to be not larger than 1 degrees . The advantages of the method proposed is that one obtains the actual values of angles measured even in the presence of magnetic fields.
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