ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
We have utilized a "multilayer'' monochromator (a pair of layered synthetic microstructures) in small-angle x-ray scattering/diffraction studies of biological materials. Many biological applications of the SAXS/D technique, in particular time-resolved studies, are often limited by the flux available to experiments. The wider energy bandpass of the multilayer monochromator provides a higher beam flux by a factor of 10 or more, compared with that of the Si(111) double-crystal monochromator. At the SSRL BL 4-2 SAXS/D facility, two types of multilayers have been used: Mo/C on Si substrate, fabricated at Lawrence Berkeley Laboratory [S. Brennan et al., Nucl. Instrum. Methods Phys. Res. A 347, 417 (1994)] and Mo/B4C on Si substrate, obtained from Osmic, Inc. The energy bandpass of the former multilayer is about 150 eV at 10 keV, and that of the latter is expected to be slightly wider. A pair of the latter multilayers gives 8 x 1011 photons/s in a beam size 1 x 2 mm2 (FWHM) at a photon beam energy of 9 keV and a SPEAR ring current of 85 mA. We will present excellent quality diffraction/scattering patterns from muscle fibers and protein solutions that show no significant smearing artifacts due to the wider energy bandpass. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1147394
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