1. A bcc metal single crystal was sliced along (1 -1 0) plane for TEM study. Assuming that the TEM available is equipped with a goniometer stage which tilts up to 45o. The Burgers vector of perfect dislocations in bcc structure is a/2.

First, the specimen was examined with its foil surface nearly perpendicular to the incident beam. Can we determine all possible Burgers vectors from the two-beam condition analysis, considering the diffracted spots in the pattern near [1 -1 0] zone axis. Give the simplest combination of examinations and identify the vectors which can be determined uniquely.