Spectroscopic Signature of Aging in (Delta)-Pu(Ga) Page: 4 of 18
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Scientifically, the actinides remain an unresolved subset of condensed matter
physics and chemistry. The physical and electronic structures of the actinides and
actinide compounds have been the subject of many important and sophisticated
investigations in the recent past.1-15 Technologically, the issue of aging is of immense
significance with long term impact on public policy. 16)
Previously, we reported the observation of strong age-dependent effects in the
resonant photoelectron spectroscopy (RESPES) of Pu,17) but were unable to explain these
observations. RESPES is a type of photoelectron emission in which additional emission
channels are accessed along with the usual direct channel of photoemission. These
additional channels are associated with core level excitations and a type of Auger-like
decay. It was found that the RESPES effect was AMPLIFIED in an aged S-Pu(Ga)
sample, instead of diminished as one might expect. So, once again, Pu has exhibited a
counter-intuitive effect, but this time it appears to be associated with the Pu aging
process. Examples of this are shown in Fig. 1. In this report, we will demonstrate that
these spectroscopic observations can be directly correlated with nanoscale disruptions of
the mesoscopic ordering the Pu(Ga) physical structure.
The resonant photoemission experiments were carried out at the SpectroMicroscopy
Facility (Beamline 7.0)17) at the Advanced Light Source in Berkeley, CA, USA. In the
photoelectron (and x-ray absorption) measurements, the photoelectron (sample current)
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Chung, B W; Schwartz, A J; Ebbinghaus, B B; Fluss, M J; Haslam, J; Blobaum, K M et al. Spectroscopic Signature of Aging in (Delta)-Pu(Ga), article, December 13, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc874243/m1/4/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.