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PrAg is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Pr is bonded in a body-centered cubic geometry to eight equivalent Ag atoms. All Pr–Ag bond lengths are 3.29 Å. Ag is bonded in a body-centered cubic geometry to eight equivalent Pr atoms.
A lot of tests and experiments have been made in Graz during the last 2 years to increase performance and accuracy; using the SPAD from the Prag group as receiver, we have reached now about 5 mm RMS from the calibration target, and about 8 mm RMS from ERS1 and STARLETTE. In addition, by routinely using the semitrain, the number of returns has been increased significantly for most satellites.
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