ISSN:
1600-5767
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Geosciences
,
Physics
Notes:
Wavelength-dependent reflectivity measurements of neutron monochromators, Pb(200), Ge(111), Zn(10\bar 10) and Be(10\bar 10) were made with a triple-axis spectrometer. The first two axes, in antiparallel arrangement, were employed to yield a monochromatic neutron beam. Pb(200) reflectivity was measured in reflection geometry. The other monochromators were studied in Laue (transmission) geometry. Experimental relative reflectivity values for Ge(111) for 0.83〈λ〈2.39 Å compare favorably with the corresponding calculated values. For all the other monochromators there is fair agreement for λ 〉 1.27 Å between the relative, measured and calculated, reflectivity values. The general behaviour of the experimental (reflectivity) values, both in the absolute and relative sense, is not in good agreement with the calculations. The measured integrated reflectivities of Ge(111), Pb(200), Zn(10\bar 10) and Be(10\bar 10) reflections are ∼0.1, 0.16, 0.5 and 0.9 of the respective calculated values.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0021889876011357
Permalink