Surface Chemistry End Station (Collaborative Access)

The Surface Chemistry end station, outlined in the figure above, is designed for soft X-ray photoelectron spectroscopy (PES), X-ray emission spectroscopy (XES) and X-ray adsorption spectroscopy (XAS) of surface and solid state samples of up to 10mm in diameter having ultra-high vacuum compatibility. The end station is equipped with an electron spectrometer (R3000, VG-Scienta) for PES and a soft X-ray emission spectrometer housing 2 gratings for photon energies from about 220 eV to 630 eV with a maximum resolving power of about 2000. A manipulator (VG Omniax) allows transfer of the sample(s) between the preparation chamber and the analysis chamber. Sputtering facilities, evaporation sources, mass spectrometer and LEED optics are available in the preparation chamber.

The sample setup, illustrated in the figure above, is optimized for studies of adsorbate systems prepared on single crystal surfaces. Temperatures between 30 and 1500 K can be achieved through cooling with liquid N₂ (He) and heating performed by electron bombardment (with or without a bias). Temperature is measured by thermocouples connected to the sample.

The Surface Chemistry end station has been tested and operated at BL 13-2 at SSRL and provided results at LCLS (1-3). The end station owners intend to further develop this end station for more dedicated use at LCLS.