Facilities for the Performance of Fano Effect Measurements as a Probe of Electron Correlation Page: 4 of 7
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level, when actual collection is underway. Regardless, under many conditions, these
problems are inconsequential. Spin resolution is achieved by directing the electrons
through the optics and into the Mini-Mott detector. (Figure 1) In this case, the high
voltages on the channel plates are turned off and the channel plates and anode assembly
become part of the first lens stack, directing the electrons into the 900 spherical sector.
The 90'sector is run at a relatively high pass energy: energy resolution is provided solely
by the hemisphere and the photon monochromator. Because the multi-channel detection
is at the exit plane of the hemisphere, the imaging of the hemisphere entrance slit onto the
multi-channel analyzer is unperturbed and high resolution non-spin counting is achieved.
Furthermore, since the spin resolving detection does not require precise imaging, the
burden of high-resolution spatial imaging is lifted from the 90'sectors. This allows the
90'sectors to be run at high pass energies, optimizing throughput. The 900 sector serves
one salient purpose: it allows the simultaneous resolution of both the vertical spin (x)
and the spin along the electron emission direction(-z). These two components are of
particular importance in our experiments. After the 900 sector, the electrons travel
through another lens stack, into the Mini-Mott detector. In the Mini-Mott, the electrons
are accelerated to 24 kV, with four channeltrons positioned horizontally and vertically
used for electron counting. While suffering from a relatively low figure of merit, the
Mini-Mott has two key advantages to our design. First, it provides essentially turn-key
operation with the requirement of no special preparation. Second, it has been shown that
the electron optical matching of a spin detector to a large hemisphere can be optimized by
the use of a Mini-Mott.
Diagram of the Electron Analyzer
Er, rgyR z
Diagram of the electron energy analyzer,
including the 90 degree sector and Mini-
892 888 884 880 876
Binding Energy (eV)
Shown here is an example of the Fano
Effect in a core level of "nonmagnetic"
Ce. Circularly polarized x-rays at 1375
eV were used for the excitation. See
Ref. 1 for more details.
MRS Symp Proc, Tobin
Ce 3d52 h.=1375 eV
A (3d 4f )
- II l B (3d42
- run 1
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Tobin, J G; Yu, S W; Komesu, T; Chung, B W; Morton, S A & Waddill, G D. Facilities for the Performance of Fano Effect Measurements as a Probe of Electron Correlation, article, November 8, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc885199/m1/4/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.