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Several aspects of core-level photoelectron em1sswn from solid surfaces as excited by high-brightness variable-polarization synchrotron radiation have been studied with a new beamline and experimental station at the Advanced Light Source in Berkeley. These include: resolution of different chemical states and site types via high-resolution photoelectron spectroscopy (PS), the use of state-resolved photoelectron diffraction (PD) . to determine local atomic geometries, and the observation and analysis of circular dichroism (CD) effects in photoelectron diffraction. These methods have been applied to clean and oxygen-exposed surfaces ofW(llO). Full-solid-angle photoelectron diffraction from clean W(llO) was measured, with the surface and bulk atoms being clearly resolved. This provided a test case for R-factor structure analysis of low energy photoelectron diffraction data, with experiment compared to theoretical calculations based on multiple-scattering theory. We found a 4.5% outward relaxation of the surface W layer, in good agreement with prior measurements. We also determined the positions. of o~ygen atoms in a saturated (lxl) oxygen overlayer on W(llO) from full-solid-angle photoelectron diffraction with chemical state resolution, arriving at an W -oxygen interplaner distance of 0.91 ± 0.05 A and a small shift from the geometric center of the pseudo-threefold hollow sites on W(llO) by O.IOA in the (1 TO] direction. Using timeand state-resolved measurements, we studied the adsorption kinetics of oxygen on W(ll 0), finding that gas pressure is an important variable in the kind of adsorption structure formed, with low-pressure adsorption in the 1 o-9 torr range not leading to any

Time-and-state resolved spectroscopy, diffraction, and circular dichroism in core photoelectron emission from clean and oxygen-covered W(110)