Method and apparatus for performing an NMR experiment

US4820983A · kind A · utility

Inventors

• Max R. Bendall · Forsayth, AU
• David T. Pegg · Calle de la Era, AU

Key dates

• Filing date: Aug 6, 1987
• Grant date: Apr 11, 1989
• Expiry date: Aug 6, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/446
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a method for NMR excitation of a sample, an Rf pulse is applied to an irradiation coil (6) proximate the sample, in the presence of an external DC magnetic field and an adiabatic passage is performed wherein the Rf pulse is controlled such that: EQU B.sub.1 =V A sin 2.pi..nu.t and .DELTA.H=A(cos 2.pi..nu.t+s), EQU or EQU B.sub.1 =v A cos 2.pi..nu.t and .DELTA.H=A(sin 2.pi..nu.t+s), where s=S/A, where S is the frequency offset of a nucleus from the center of the spectrum, and where v allows for variation of B.sub.1 throughout the sample, .DELTA.H is the resonance offset of the nuclear spins, and B.sub.1 is the rf field of a spin-lock pulse.