A New Spin on Photoemission Spectroscopy Page: 84 of 259
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Chamher N. Ion Pump
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Figure 2.15. 3D schematics of the lab ARPES station. Two side views and a top view.
pumping-tree at the bottom with a large 500 t/s ion pump, a 500 t/s turbomolecular
pump, and a 10" flange titanium sublimation pump (TSP). After a good bakeout, the main
chamber has reached as low as 3 x 10-11 torr and below 2 x 10-11 torr with the additional
cryo-pumping when the cryostat is brought to liquid He temperatures. Inserting and re-
moving samples from vacuum is done through a dual-stage air-lock. Up to 12 samples can
be inserted/removed directly from atmosphere into the compact "Load-Lock" which can be
pumped via a 70 t/s turbo pump to - 2 x 10-7 torr within a half-hour and to - 2 x 10-8
torr in a couple hours. Samples can then be individually transfered between this chamber
and a sample-storage chamber that is held at - 2 x 10-10 torr by an ion pump and a small
TSP with the use of a magnetically coupled transfer arm (very similar in concept to that
used by Millikan! 34). Samples are manipulated in vacuum by first affixing them to 1" cop-
per or molybdenum "pucks" which can be and transfered around in the vacuum system in
a variety of ways. Sample pucks are held on compact carousels in the load-lock and storage
chambers, with the pucks held in place by two angled stiff phosphor bronze wires which
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Jozwiak, Chris. A New Spin on Photoemission Spectroscopy, thesis or dissertation, December 1, 2008; United States. (https://digital.library.unt.edu/ark:/67531/metadc1014237/m1/84/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.