Bruker Biospin Gmbh

Bruker Analytische Messtechnik Gmbh

Other

Peter Hoefer

Dieter Schmalbein

Alexander Krahn

Frank Engelke

Ion Prisecaru

Marian Kloza

Karoly Holczer

Andreas Kamlowski

Diether Maier

George William Over

Grant Lysle High

Detlef R Mueller

Ulf Anders Tapper

An EPR resonator for a cylindrical TE01n microwave mode, where n=1, 2, 3, or 4, has: a cylindrical body () which has an RF absorption of less than 5% at RFs below 1 kHz, a first plunger () delimiting the resonating volume within the body in an axial direction at a first end and a second plunger () delimiting the resonating volume within the body at a second end, the second plunger having an opening () for inserting an EPR sample. The first and second plunger each has a spiral winding of an electrically conductive filament wherein neither the ends nor neighboring turns of the spiral windings have electrically conductive connections prone to forming electrically closed loops. Using spiral winding plungers for cylindrical TE01n microwave modes provides equivalent functionality compared to conventional plungers, but without creating Eddy currents at frequencies lower than the frequency of the TE01n microwave mode.

EPR resonator with extended transparency and homogeneity in RF range

A microwave resonator for an EPR probe head has a metal cavity body () supporting an electromagnetic microwave resonance mode. The metal cavity body () has an opening for inserting a sample tube () to a center position of the resonator. The center of the opening and the center position of the resonator define an x-axis. The cavity body also has an opening for transmitting microwave radiation into the resonator. Two dielectric elements () are located symmetrically to the E-field nodal plane containing the x-axis and a z-axis perpendicular to the x-axis. Each dielectric element is geometrically formed and positioned such that it provides an equal overlap with a local maximum of the microwave electric field energy. The microwave resonant cavity has a thin planar shape and the resonator is loaded with two dielectric elements, placed symmetrically relative to the central EPR sample.

EPR microwave cavity for small magnet airgaps

A resonator assembly for executing measurements on a sample within a constant magnetic field Bby means of magnetic resonance is disclosed. It comprises a resonator portion defining a longitudinal axis and an axial direction. The resonator portion has, along the axial direction, a hollow cavity for exciting electron resonance within the sample. A coupling portion is provided adjacent the resonator portion and has, along the longitudinal axis, a stepped through being electrically conductive at its inner surface. A first, middle section of the stepped through configures the hollow cavity. A second and a third, lateral section adjacent axially opposed sides of the hollow cavity are each dimensioned such that a basic mode being resonant within the hollow cavity is unable to propagate within the second and the third section. A coil is wound around the resonator portion for additionally exciting a nuclear resonance within the sample. The resonator portion comprises a toroidal body made from an electrically conductive material within which there is provided the stepped through. The toroidal body is provided with at least one axial slit.

Magnetic resonance resonator assembly

A probe head for nuclear magnetic resonance measurements comprises a sample holder having a stator and a rotor. The rotor is journalled for rotation about an axis of rotation within the stator. It is adapted for receiving a sample substance. The axis of rotation is inclined by an angle with respect to a longitudinal axis of the probe head. The stator is configured as a dielectric resonator.

Probe head for nuclear magnetic resonance measurements

A resonator apparatus and a method for electron spin resonance (ESR) measurements are disclosed. The resonator apparatus comprises a dielectric resonator and a sample vessel extending through the resonator. The sample vessel is configured as one single flexible tube. Means are provided for conveying a liquid sample substance through the flexible tube. According to the method a liquid sample substance is guided through the sample vessel, wherein the sample substance is gated by cyclically conveying and stopping, resp., a flow of the sample substance. A measurement is conducted within the resonator when the flow of sample substance is stopped.

Resonator apparatus for electron spin resonance (ESR) measurements and method for measuring electron spin resonance (ESR) signals

A method and an apparatus are disclosed for detecting a first substance within a second substance, preferably for localizing diamonds in kimberlite rocks. The first substance, e.g. the diamonds, have a very long spin-lattice relaxation time (T.sub.1) in the order of hours. For rapidly detecting the first substance, the build-up of magnetization of a predetermined kind of nuclei, e.g. .sup.13 C, being abundant in the first substance only is shortened and the nuclear magnetic resonance of that kind of nuclei is measured thereafter. The shortening is executed within a pre-treatment station, whereas the measurement takes place within an analyzing station. The shortening and the measuring, respectively, are carried out within magnetic fields (B.sub.01, B.sub.02) of different field strengths.

Method and apparatus for measuring samples and for localizing a first

A method and an apparatus are disclosed for detecting an atomic structure of a sample along a surface thereof. The method comprises arranging the sample in a constant magnetic field (B.sub.0) of predetermined field strength and high homogeneity and irradiating a high-frequency magnetic field (B.sub.1) of a predetermined frequency on the sample, wherein the fields (B.sub.0) and (B.sub.1) are oriented perpendicularly to each other. The method further comprises providing a force-sensitive sensor having a paramagnetic tip comprising a paramagnetic material. The sensor is placed in close vicinity to the sample such that the paramagnetic tip is in atomic interaction with the sample surface which means that the distance between the tip and the surface is in the order of between 1 and 10 .ANG.. The predetermined field strength and the predetermined frequency are set such that electron paramagnetic resonance (EPR) is excited within the tip paramagnetic material. The paramagnetic tip is then displaced parallel to the sample surface for mapping predetermined points on the sample surface. During displacing the tip the force exerted on the tip by a local inhomogeneous magnetic field (B.sub.loc) caused by atomic magnetic moments (m.sub.e,k) of the sample is measured.

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Ettlingen, Germany

Peter Hoefer