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A cell for X‐ray diffraction in liquids under moderate hydrostatic pressure
Author(s) -
Geeves M.,
Knight P.
Publication year - 1989
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889889008277
Subject(s) - materials science , kapton , diffraction , hydrostatic pressure , composite material , distortion (music) , optics , gasket , hydrostatic equilibrium , foil method , analytical chemistry (journal) , chemistry , chromatography , optoelectronics , polyimide , mechanics , cmos , amplifier , physics , layer (electronics) , quantum mechanics
A portable cell is described which allows X‐ray diffraction data to be collected from suspensions or mounted specimens in liquid under hydrostatic pressure. Pressure is applied via either an oil pump or a high‐performance liquid chromatography pump. The temperature of the cell is controlled by a thermostatted baseplate. X‐rays pass through the stainless steel block via windows of Kapton V plastic sheet which will withstand a pressure difference of at least 15 MPa. Distortion of the plastic under pressure increases the liquid path of the X‐rays. This distortion can be reduced by stretching over dome‐shaped supports. Under these conditions 10 MPa causes a reduction of intensity of between 10 and 50%, depending on window geometry. Specimens can be mounted on a removeable frame, and the solution in the sample chamber can be changed without disassembling the cell. The apparatus has been used successfully to study the low‐angle diffraction from muscle.