Abstract: An optical spectrometer (1) with an interferometer having a means for varying the optical path difference comprising a drive (8), and with a detector (6) for recording optical signals from the interferometer and converting them into electrical analog signals, wherein an analog-to-digital converter (ADC) (9) is connected to the detector (6) digitizing the electrical analog signals in a time-equidistant manner, is characterized in that the data acquisition electronics (17) are supplied by a switched power supply (14), the clock of which is derived from the same reference oscillator (16) as the clock of the signal digitization by the ADC (9). In contrast to known spectrometers with spatially equidistant sampling of the detector signal, the design of the spectrometer according to the invention is considerably cheaper and more compact with respect to its voltage supply elements. Galvanic separation of the data acquisition electronics and the electronic control unit of the linear drive is no longer required.

Abstract: Magnet arrangement for a one-sided NMR tomography system having a permanent magnetic ring (4) of an outer radius R.sub.a and an inner radius R.sub.i and being magnetized axially in the direction of the z-axis and extending in the axial direction up to a plane E (z=z.sub.E) for generating a homogeneous magnetic field B in a measuring volume (2) is characterized in that, in a radial region R<R.sub.i, at least one further permanent magnetic field-generating element, which is rotationally symmetric, is arranged with respect to the plane E on the same side as the permanent magnetic ring (4) at an axial distance from plane E, whereby a depression V is formed on the surface of the magnet arrangement (1) facing plane E and that the permanent magnetic field-generating elements generate at least 90%, preferably 99% of the homogeneous magnetic field B in the measuring volume (2).

Abstract: The invention concerns a two-dimensional heteronuclear correlation spectroscopy method for the measurement of solid state NMR samples. The nuclear spins are decoupled in the evolution interval by means of a FSLG-RF pulse sequence irradiated in the proton frequency band. Since this sequence may be very short compared to the ones hitherto used, and it is not necessary to irradiate simultaneously radio frequency in the area of the S-nuclei, the method is suitable in particular for high rotational velocities of the sample and high magnetic fields, where it effects a considerable improvement of the resolution.

Abstract: The invention concerns a magnet system (1) for charging of a superconducting magnet coil (3). The magnet system (1) is characterized by control means (4) for reading-in and controlling which read-in data of a storage medium (7) associated with the superconducting magnet (3) into a power supply (2) and which control the charging of the superconducting magnet coil (3) by the power supply (2) using the read-in data. The magnet system (1) facilitates a fully automatic, safe and rapid charging of a superconducting magnet coil (3) and guarantees better reproduceability and an optimal charging process.

Abstract: The invention concerns a superconducting magnet configuration for a high resolution NMR spectrometer which is highly stable over time and having a cryostat (21) with a vertical room temperature bore (23). A transverse access (32) through the cryostat (21) to the room temperature bore (23) is provided for at an easily accessible height directly above the upper end of the superconducting magnet coil (25) to substantially simplify the introduction of a sample. In a system having two helium tanks (26, 27), it is advantageous to have the access (32) arranged between these helium tanks.

Abstract: The invention concerns a NMR measuring cell, in particular one for a flow-through probe head (1) and having at least a first inlet opening (10) to introduce a first injected or pumped reaction liquid into the measuring cell (1) and a second inlet opening (11) for introduction of a second injected or pumped reaction liquid into the measuring cell (1). The measuring cell (1)is subdivided by means of an at least partially movable wall (2) into at least a first chamber (17) which communicates with the first inlet opening and a second Chamber (19) which communicates with the second inlet opening (11). The at least partially movable wall (2) is configured and adapted in such a fashion that directed motion thereof leads to a mixing together of the first reaction liquid separately stored in the first chamber (17) with the second reaction liquid separately stored in the second chamber (19). In accordance with the invention a rapid and homogeneous mixing-together of the two reaction liquids is achieved in milliseconds.

Abstract: The invention relates to a method for the rapid detection and enumeration of microorganisms. The spectroscopic detection is carried out, after brief incubation of the sample to be tested, by the detection of the growth of microcolonies, which is not yet detectable with the naked eye, on a solid culture plate following direct transfer of said microcolonies to a sample carrier by special impression techniques; the detection itself is carried out by recording the spectra of all, or of a representative number, of the impressions, using an IR microscope. It is not only possible to make statements with regard to the number of microorganisms in the sample but the high information content of the spectra can also be used for demanding microbiological differentiation work down to species identification.