An EPR study of x-irradiated lead acetate trihydrate at 77 °K has strengthened the identification of two recently reported species, Pb1+ and PbH2+. The first of these results from radiation-induced electron trapping by coordinated Pb2+ ions, and the second center consists of a hydrogen atom that is weakly associated with a plumbous ion in the crystal lattice. The radical PbCH32+ was also observed. A detailed study of the Pb1+ center reveals that the diagonal components of the 207Pb hyperfine coupling tensor are very large and anisotropic, and that the characteristic g tensor is almost isotropic. These data are interpreted in terms of a bonding scheme that locates the unpaired electron in a hybridized molecular orbital that possesses 6s, 6p, and possibly some 5d, character. A comparison of our data for Pb1+ with published data for Pb3+ reveals striking differences.

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Theoretical calculations indicate that Aurora diode geometrical reconfigurations that delay the onset of magnetic insulation should yield a decreased risetime. Experimentally these diode modifications have resulted in a decrease of the beam risetime from approximately 80 ns to 20 ns. * ne first portion Of this work was =med Out Corporation. Newington, VA. Figure 12. Detailed comparison of a fast-rising photodiode trace (PD5) with the diode voltage pulse P E) as measured by the electrostatic probe. (The initial spikes on the traces are fiducial markers.) This measured risetime (10 ns) was achieved by combining a "falsework" diode with drift tube nose erosion. See reference 9.