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23 Jul 2002: 4–1. 4. Coherence Selection:Phase Cycling and Gradient Pulses. 4.1 Introduction. The pulse sequence used in an NMR experiment is carefully designed toproduce a particular outcome. For example, we may wish to pass the spinsthrough a state of

5 Mar 2002: Is the magnet sufficientlyhomogeneous to be of use? E 5–2A careful pulse calibration experiment determines that the 180 pulse is 24.8µs.

5 Mar 2002: 2 3. 4. ν0,1 ν0,2. frequency. 13. 24. 12. 3424 1334 12. ... 13 57 24 68. spin 2spin 3. αα. α ββ α β.

5 Mar 2002: increasing τ. Fig. 3.24 Visualization of the outcome of an inversion recovery experiment. ... 3.24. 3.11 Off-resonance effects and soft pulses. -y. z. xb. c.

12 Mar 2002: 9–1. 9 Coherence Selection:Phase Cycling and Gradient Pulses†. 9.1 Introduction. The pulse sequence used in an NMR experiment is carefully designed toproduce a particular outcome. For example, we may wish to pass the spinsthrough a state of

12 Mar 2002: 13. 23 0 3. 11. 24 0 2. 112. 22 0 2. ... 11. 24 0 3. 24. 24 2 4. 23. 22 2 1. ( ) ( ) ( ) ( ). ( ) ( ) ( ) ( ).

5 Mar 2002: 7–1. 7 Two-dimensional NMR†. 7.1 Introduction. The basic ideas of two-dimensional NMR will be introduced by reference to theappearance of a COSY spectrum; later in this chapter the product operatorformalism will be used to predict the form of

5 Mar 2002: 1 24 2 2 2+ ( )In a heteronuclear system a coherence order can be assigned to each spin.