Albrecht, M.; Antesberger, H.; Moritz, Wolfgang; Plöckl, H.; Sieber, M.; Wolf, D.
Six-circle diffractometer for surface diffraction using an in-vacuum x-ray detector.
In: Review of Scientific Instruments, Vol. 70, No. 8: pp. 3239-3243
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We report on the design of a diffractometer, which offers improved capabilities for x-ray experiments in ultrahigh vacuum. Its main features are (i) the possibility to follow the evolution of diffraction spots in situ during adsorption or film deposition; (ii) the measurement of reflections at high exit angles, i.e., large perpendicular momentum transfer. This goal is achieved by placing a movable x-ray detector inside the vacuum chamber. (iii) Other surface analysis equipment, e.g., a low-energy electron diffraction or an electron energy analyzer can be moved in front of the sample and operated simultaneously with x-ray diffraction. (iv) A load lock system - currently in preparation - will allow the quick exchange of samples without breaking system vacuum. In addition, a new design of the chi circle used for sample alignment provides a compact, space-saving design of the diffractometer.