4results about "Measurements using double resonance" patented technology

The invention relates to an NMR-DNP probe comprising a sample holder, a temperature control device, a microwave guide and an illumination device, characterized in that the temperature control device comprises a VT channel through which a temperature control fluid can be supplied to the sample container for temperature control of the sample substance in NMR measurement mode, a sample-side end of the light guide is arranged in the VT channel, and a deflection mirror is arranged in the VT channel between the sample-side end of the light guide and the sample container, which directs the light exiting the light guide onto the sample substance in the sample volume of the sample container. This allows additional light excitation with adjustable beam width to illuminate the NMR test sample within the probe without negatively affecting the magnetic field or RF. Furthermore, optical excitation in the UV range can also be realized. The optical fiber is integrated into the probe with a very small bending radius. The invention also relates to a bearing bushing for use in an NMR-MAS probe and to an NMR spectrometer.

A system and method for increasing the nuclear spin polarization of a target compound are disclosed. According to such a system and method, a first non-thermal equilibrium nuclear spin polarization may be imparted to source atoms of at least one source compound, the source atoms having a nuclear gyromagnetic ratio of at least 12 megahertz per Tesla (MHz / T). A first solution including a source compound and a target compound can be obtained. The at least one source atom can be present in the first solution at a source concentration of at least 0.1 molar (M). A second non-thermal equilibrium nuclear spin polarization of at least 0.01% can be imparted to at least one target atom of the target compound via a Nuclear Overhauser Effect (NOE) transfer of the first non-thermal equilibrium nuclear spin polarization to at least one target atom.

An NMR-DNP probe head comprises a probe holder for receiving a sample vessel containing a sample substance surrounded by an RF coil, a temperature control device for maintaining the temperature of the sample substance, a microwave guide for supplying microwave radiation into the sample volume, and an illumination device comprising an optical fiber for photoinduced electron excitation of the sample substance in the sample volume. The temperature control device comprises a VT channel through which temperature control fluid can be supplied to the sample vessel during NMR measurement to maintain the temperature of the sample substance, the sample-side end of the optical fiber is arranged in the VT channel, and a deflecting mirror is arranged in the VT channel between the sample-side end of the optical fiber and the sample vessel that directs light exiting the optical fiber onto the sample substance in the sample volume of the sample vessel.