Geoffrey Bodenhausen

55811825, Dec 3, 1996

Jul 19, 1995

8/504171

Riqiang Fu - Tallahassee FL
Geoffrey Bodenhausen - Tallahassee FL

Florida State University - Tallahassee FL

G01V 300

324309

Methods and apparatus for broadband decoupling in nuclear magnetic resonance with chirp and other RF pulses are disclosed. Such methods may include the step of positioning the sample in a static magnetic field. Additional steps may define a first cycle of pulses, such as chirp pulses, wherein at least two of the pulses have a different initial phase angle from each other and may define a second cycle of pulses wherein at least two of the pulses in the second cycle have an initial phase angle different from the initial phase angles of the pulses in the first cycle. Further steps may repeatedly generate a supercycle of the first and second cycles to produce pulses for inverting the longitudinal magnetization in the sample and may also detect the signals emitted by the sample in response to inversion of the longitudinal magnetization. Alternatively, the chirp pulses in the first and second cycles may be defined to sweep a bandwidth of 100 kHz or more. The first and second cycles may also be defined to include linear frequency modulated RF pulses wherein each of the RF pulses has an amplitude which is substantially constant during at least about 50% of the pulses.