Nuclear magnetic resonance spectrometer with jointly functioning external and internal resonance stabilization systems

Claim 1

A nuclear magnetic resonance spectrometer with jointly functioning external and internal NMR stabilization systems comprising an electromagnet, said electromagnet having poles with pole faces, magnetically responsive correction coils disposed between said poles and having an axis perpendicularly orientated with respect to said pole faces, an internal nuclear magnetic resonance stabilization system having an output and an input, said correction coils being connected to said output of said internal stabilization system, an analytical nuclear magnetic resonance probe, said analytical probe being disposed within a zone defined by said coils and connected to said input of said internal stabilization system, a reference nuclear magnetic resonance probe, said reference probe being disposed within the magnetic field of said electromagnet, said reference probe being located outside said zone defined by said coils, an external nuclear magnetic resonance stabilization system, said external system being connected to said reference probe, a radio-frequency source, said radio-frequency source being connected to said analytical and said reference probes and producing a signal at a resonant frequency for irradiating samples of said probes, a pair of modulators, each of said modulators being connected to a respective one of said probes, means to record the signal produced by said analytical nuclear magnetic resonance probe, and further correction coils arranged on the poles of said electromagnet and connected to the output of the external stabilization system.