Bedzyk Research Group - 18 kW


18 kW Rotating Anode Two-Circle Diffractometer

The 18 kW is used for:

    • X-ray Reflectivity (XRR) → Electron density profile
    • X-ray Standing Waves (XSW) → Heavy atom density profile
    • X-ray Fluorescence (XRF) → Heavy atom coverages

Schematic of the 18 kW setup.
Specifications:

- 18KW RU 300 Rotoflex Rigaku Rotating Anode (Purchased new by MRC in 1989)

- Mo Anode  (also have choice of Cu, Cr, or Zr) Zr sputter deposited on Cr target (5/07)

- Line Source (LS): Normal Line Focus 0.5mm x 10 mm,  18 KW max power

- The effective line width is 50 mm due to the 6o take-off angle

- Operating power: 50 KV, 240 mA

- Osmic Max-Flux Optic MF15NP-Mo (MM),  followed by Huber 4-blade slit  (S0)
  • graded d-spacing parabolic multilayer collimating mirror. dave= 33.04 Å
  • Transmits: Mo Ka1 (0.70932 Å) + Ka2 (0.71361 Å) ,   Kb/Ka ratio = 5.7x10-4
  • Flux=3x108 p/s 0.3mm x 4 mm slit, 10mm beam height at sample
  • 0.025X divergence, qave=0.62o, Dl/l =  0.04
- (Optional) Si(111) channel-cut (CC) 2-bounce monochromator  (also  have choice of (220), (004), (333) )
  • Transmits: Mo Ka1 (l = 0.70932 Å, 10-eV-line-width-2G -> Dl/l = 5.7x10-4) Flux=2x107 p/s
  •  0.001o divergence

- Huber 4-blade incident beam slit (S1)

- 2-circle diffractometer (starting from the bottom to the top)
  • Newport translation
  • Huber 415 2-circle , w/ 20:1 gear-reducers
  • Piezo Torsion-bearing ultra-fine w-rotation stage for single xtal XSW
  • Huber 1003 X-c-f goniometer
  • Sample holder
  • 2-theta arm w/ guard slit (S2), XIA filter box, detector slit (S3), Cyberstar NaI X-ray detector

- Auxillary equipment:

  • Goniometer pin
  • X-ray Eye
  • High-power zoom lens camera