Two-axis neutron and X-ray reflectivity: How to avoid alignment pitfalls and how to correct for them

Journal of Neutron Research

Volumn 5, Issue 3, 1997, Pages 133-146

  Bouwman, Wim G ^a   Vigild, Martin E ^a   Findeisen, Eberhard ^a   Kjaer, Kristian ^a   Feidenhans’l, Robert ^a   Mol, Elisabeth A L ^b  

^a TECHNICAL UNIVERSITY OF DENMARK   (Denmark)

^b FOM INSTITUTE AMOLF   (Netherlands)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 85013587099     PISSN: 10238166     EISSN: 14772655     Source Type: Journal    
DOI: 10.1080/10238169708200219     Document Type: Article

References (11)

1. T.P. Russell, Mater. Sci. Rep., 5, 171-271 (1990).
2. J. Penfold and R.K. Thomas, J. Phys., C2, 1369-1412 (1990).
3. E. Findeisen, R. Feidenhans’l, M.E. Vigild, K.N. Clausen, J. Bindslev Hansen, M. Bentzon and J.P. Goff, J. Appl. Phys., 76, 4636 (1994).
4. M.E. Vigild, E. Findeisen, R. Feidenhans’l, K.N. Clausen, C. Barholm-Hansen, M. Bentzon and J.B. Hansen, J. Appl. Phys., 79, 4050-4056 (1996).
5. E.A.L. Mol, W.H. de Jeu and W.G. Bouwman, to be published (1996).
6. W.G. Bouwman and J. Skov Pedersen, J. Appl. Cryst., 29 152-158 (1996).
7. In x-ray reflectometry one can usually do further fine tuning by using the absorption of x-rays by the sample: First one sets the spectrometer to detect the direct through going beam. Then the sample is translated until it blocks half of the direct beam. Subsequently, the sample is rotated to have a minimum blockage, corresponding to a position parallel to the direct beam. These last two steps are repeated until they converge. This procedure works only if the sample strongly absorbs the beam, which is usually not the case with neutrons, for which many samples are transparent.
8. arm = 537 mm will be used in the following.
9. J.D. Shindler and R.M. Suter, Rev. Sci. Instrum., 63, 5343-5347 (1992).
10. L.G. Parratt, Phys. Rev., 95, 359-369 (1954).
11. This is equivalent to dividing the refractive indices by the refractive index of the first medium, since the refractive indices are close to one.