Chamber	Sample Holder

(click to enlarge)

The Electronic Structure Factory

The ESF endstation (formerly known as XPD) is a general-purpose endstation devoted to angle-resolved photoemission from a variety of materials, based on a Scienta SES-100 Analyzer..

The endstation is capable of heating (> 2000 C) and cooling (< 17 K). Sample characterization facilities include sputtering, LEED, off-line ESCA (Mg and Al anodes) and sample evaporation. There is a separate, attached preparation chamber with ion gun, a quartz microbalance, SPECS LEED, magnetization coil, and provision for installation of various evaporation cells.

Previous experiments include: x-ray photoelectron diffraction, valence bandmapping, and microanalysis (spot size approx 50 micron). Samples studied include magnetic multilayers, self-assembled nanostructures, clean surfaces, correlated materials, semiconductors, metals, etc.

The full specifications (somewhat outdated) are found here.

Home movies from the ESF chamber

(require Quicktime player)

Goniometer in motion

This is a 2-polar axis (q-b) scan of the goniometer angles. The camera which is normally used to detect electron counts has been replaced by a video camera looking into the chamber through a window inclined 30 degrees above the photon beam path. the photon beam and the scienta analyzer are looking at the same spot indicated by the blue crosshairs.

Volume Data Set
Volume Data Set, alternate cut

These are visualizations of a volume data set acquired for a 2-polar axis scan of the goniometer (similar to the previous movie). The first movie represents the constant-energy surfaces of the bandstructure of 1 ML H on W(110). (at binding energy zero, it corresponds to the Fermi surface). The second movie is an alternate cut showing bandmaps for constant kx as a function of ky. The data were taken at hn=95 eV.

The raw data file is almost 700MB and has been greatly reduced in size for representation here. There are 5 times more energy steps, 2 times more ky steps, and 16 times more kx steps than are shown in the movies. The data sets were rebinned in this fashion so as not to lose statistics but as a result the apparent sharpness of the bands is somewhat diminished compared to the full data set.

The data were acquired in 7 vertical strips, and the only processing to make this movie was to scale the strips to match each other smoothly, and to remap the data from (q-b)-space to (kx,ky)-space. The transformation is

kx=k sin q

ky=k cos q sin b

k (1/Å)=0.5124 sqrt( hn + F [eV])

where F is the work function

Endstation Manual

Endstation Statistics and Contacts