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Beamlines List

BL8B   Angle-Resolved Ultraviolet Photoelectron Spectrometer for Solids

  BL8B is a beamline for the angle-resolved ultraviolet photoemission spectroscopy (ARUPS) system, which is designed to measure various organic solids such as molecular crystals, organic semiconductors, and conducting polymers. This beamline consists of a plane-grating monochromator (PGM), a sample preparation chamber with a fast-entry load-lock chamber, a measurement chamber (base pressure 1 × 10-10 Torr), a cleaning chamber (base pressure 1 × 10-10 Torr), and a sample evaporation chamber (base pressure 3 × 10-10 Torr). The cleaning chamber is equipped with a back-view LEED/AUGER, an ion gun for Ar+ sputtering, and an infrared heating unit. The PGM consists of premirrors, a plane grating, focusing mirror, and a post-mirror, with an exit slit. It covers the wide range from 2 to 130 eV with two exchanging gratings (G1: 1200 l/mm, G2: 450 l/mm) and five cylindrical mirrors. The toroidal mirror focuses the divergent radiation onto the sample in the measurement chamber. The spot size of the zeroth-order visible light at the sample surface is approximately 1 × 1 mm2. Figure 1 shows the throughput spectra of PGM (slit = 100 μm). The energy resolution at a slit width of 100 μm was found to be EE = 1000 in the wavelength range from 2 to 130 eV. A hemispherical electron energy analyzer of 75 mm mean radius with an angular resolution less than 2° can be rotated around the vertical and horizontal axes. The sample mounted on a manipulator (temperature range 14?320 K) can also be rotated around two axes.

fig1    fig2

Fig. 1. Throughput spectra of plane-grating monochromator at BL8B (slit = 100 μm).

  Fig. 2. A photo of BL8B.


Technical Data

Monochromator Plane-grating monochromator
Wavelength Range 9-600 nm
Resolution E / ΔE = 1000
Experiments Angle-resolved ultraviolet photoemission spectroscopy