Abstract
A significant source of errors in quantitative electron paramagnetic resonance measurements is incorrect sample positioning in the microwave cavity. In this article a modification to our previously described sample alignment tool which allowed the precise and reproducible positioning of cylindrical samples along the vertical central axis of the rectangular cavity is described. These revisions allow cylindrical sample movement in the horizontal (y,z) plane which is perpendicular to the cavity x axis. Using this upgrade, the new sample setup procedure is now able to position samples precisely and reproducibly at arbitrary points in the intracavity space. (C) 1997 American Institute of Physics.