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Improvements in solvent-signal suppression
- Source :
- Journal of Magnetic Resonance (1969). 96:541-550
- Publication Year :
- 1992
- Publisher :
- Elsevier BV, 1992.
-
Abstract
- Three recent improvements in solvent-signal suppression are described. First, PJR (“power-adapted jump and return”) replaces JR (jump and return). It goes beyond the “infinitely short π 2 pulse” approximation and can therefore be used even when the available RF power is low. The phase shift is small, and the amplitude correction providing a flat response is simple and power-independent. With a postexcitation delay, PJR generates an echo. Second, “modified binomials,” i.e., binomials sandwiched between two π pulses are studied. This simple modification eliminates the linear phase shift, which is the main problem of binomial sequences. It has a clear theoretical basis. These two sequences are applied to the observation of a test sample of thymidine, following a proposed standard procedure for the evaluation of methods of solvent-signal suppression. Third, it is pointed out that the elimination of radiation damping would avoid the resulting rotation of the magnetic moment during the RF-free intervals within solvent-signal-suppression excitation sequences. It may be achieved by incorporating the coil in an open, series-tuned, matching circuit.
Details
- ISSN :
- 00222364
- Volume :
- 96
- Database :
- OpenAIRE
- Journal :
- Journal of Magnetic Resonance (1969)
- Accession number :
- edsair.doi...........ad77474677c3cdee369de558ea8af359