Abstract: An NMR sample holder comprises:a rotor 2,3 having a central bore 2e with an internal thread for at least a portion 2g of its length, ,a hollow cylindrical sample tube 5 having a closed end and an open end, and having an outer diameter of less than 3 mm, the diameter being such as to enable the sample tube 5 to be accommodated within the central bore 2e in the said rotor,a centring screw 7 having an external thread 7g adapted to engage the said internal thread 2g of the central rotor bore and a central bore 7e adapted to accommodate the sample tube and to centre the sample tube in the central bore of the rotor, anda sealing member 6, 6' which is a sliding fit on the sample tube 5 and adapted to form a seal with an internal surface of the central bore of the rotor and with the sample tube 5.

Abstract: An NMR spectrometer (10) for the measurement of liquid samples having a probe head (20) exhibiting an upper and a lower support (21 or 22), a connector (5) for a feed conduit (15) for the introduction of a liquid sample (1) into the spectrometer (10) and a connector (6) for a drain conduit (16) for the drainage of the liquid sample (1) out of the spectrometer (10), a sample tube (3), arranged between the upper and the lower supports (21 or 22), for the acceptance of the fluid sample (1), whereby the one end of the sample tube (3) is connected to the connector (5) for the feed conduit (15) and the other end to the connector (6) for the drain conduit (16), exhibits, coaxially to the sample tube (3) a further tube (4) for the acceptance of a calibration fluid (2) which, on one end, is connected to an additional connector (7) for a feed conduit (17) to introduce the calibration fluid (2) into the spectrometer (10) and, on its other end, to an additional connector (8) for a drain conduit (18) to drain the calibrat

Abstract: Apparatus is provided for coupled liquid chromatography and nuclear magnetic resonance (NMR) spectroscopy measurements. The apparatus includes a liquid chromatograph, an intermediate storage device for intermediately storing of components of a probe eluent and an NMR spectrometer. Selected intermediately stored components are fed to an NMR measurement unit. The intermediate storing device includes a number of capillary tubes, which are switchable by an automatically controlled valve arrangement for selectively receiving and delivering desired eluent components.

Abstract: The invention concerns head for flowthrough NMR spectroscopy in which there is provided, in the interior of a vessel, a replaceable quartz cuvette which can be separated from the vessel, and eluent inflow and outflow tube, and a measurement coil, and which has end sections which seal with respect to the vessel.The parts constituting the vessel, namely a cylindrical glass casing, a cover, and a base, as well as the replaceable quartz cuvette, can be clamped together with a simple clamping device in such a way that the sample head according to the invention can also be used for high pressure, such as those which occur with SFC (supercritical fluid chromatography) NMR measurements.

Abstract: The invention relates to an apparatus for measuring chemical and/or physical reaction sequences by nuclear magnetic resonance spectrometry and comprises a reaction path (1), a nuclear magnetic resonance spectrometer (2) and at least one reaction chamber (10) which is located in the reaction path, wherein means are provided for feeding at least the reaction product from the reaction chamber (10) to the nuclear magnetic resonance spectrometer (2). According to the invention, at least reaction chamber (10) and its reagent supply and discharge lines (5 to 7) are mounted, by means of a mounting angle (29), on the same head housing (9) on the latter's end which projects from the spectrometer magnet bore, in the stray field of the spectrometer magnet.

Abstract: A multi-experiment magnetic-resonance instrument such as a programmable pulse/Fourier-transform nuclear-magnetic-resonance ("NMR") spectrometer, an electron-paramagnetic-resonance spectrometer, or a magnetic resonance tomographic imaging device, capable of performing any one of a plurality of magnetic-resonance measurement sequences selected by a user and comprising: a magnet for generating a magnetic field; a probe having radio-frequency coupling circuitry positionable in the magnet; a radio-frequency generator/transmitter connected to the coupling circuitry of the probe; a radio-frequency receiver/digitizer connected to the coupling circuitry of the probe; a digitized-signal averager/processor connected to the receiver/digitizer; a programmable instrument controller having measurement-sequence control-program storage; a barcode reader connected to the instrument controller; and at least one measurement-sequence-selection barcode table having a plurality of barcode-encoded measurement-sequence data words arr

Abstract: A test head for NMR spectrometers comprises an rf coil mounted on a carrier pipe and a shielding which extends over at least one section of two parallel conductors extending in the axial direction of the carrier pipe. In order to improve the effect of shielding, the shielding is connected, in an electrically conductive manner, to a turn section of the rf coil which contains a cold point. The shielding is thereby maintained at a fixed neutral potential, relative to the rf voltage supplied, with the result that no fields impairing the measuring accuracy and resolution of the spectrometer can any longer exist in the shielded area. The shielding may be connected directly to one turn section of the coil, for example by soldering.