An ultrahigh-vacuum apparatus for resonant diffraction experiments using soft x rays (h nu=300-2000 eV)

作者：Takeuchi T; Chainani A; Takata Y; Tanaka Y; Oura M; Tsubota M; Senba Y; Ohashi H; Mochiku T; Hirata K; Shin S

来源：Review of Scientific Instruments, 2009, 80(2): 023905.

DOI：10.1063/1.3078269

• cryostats
• physical instrumentation control
• vacuum apparatus
• X-ray diffraction
• X-ray diffractometers

We have developed an ultrahigh-vacuum instrument for resonant diffraction experiments using polarized soft x rays in the energy range of h nu=300-2000 eV at beamline BL17SU of SPring-8. The diffractometer consists of modified differentially pumped rotary feedthroughs for theta-2 theta stages, a sample manipulator with motor-controlled x-y-z-, tilt (chi)-, and azimuth (phi)-axes, and a liquid helium flow-type cryostat for temperature dependent measurements between 30 and 300 K. Test results indicate that the diffractometer exhibits high reproducibility (better than 0.001 degrees) for a Bragg reflection of alpha-quartz 100 at a photon energy of h nu=1950 eV. Typical off- and on-resonance Bragg reflections in the energy range of 530-1950 eV could be measured using the apparatus. The results show that x-ray diffraction experiments with energy-, azimuth-, and incident photon polarization-dependence can be reliably measured using soft x rays in the energy range of similar to 300-2000 eV. The facility can be used for resonant diffraction experiments across the L-edge of transition metals, M-edge of lanthanides, and up to the Si K-edge of materials.

• 出版日期2009-2