pulsed nuclear magnetic resonance · pulsed nuclear magnetic resonance before coming to lab: 1....
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Pulsed Nuclear Magnetic Resonance
Before Coming to Lab:
1. Read the Introduction section of this manual (p. 1-13) for an explanation of the theory of thenuclear magnetic resonance (NMR) technique.
2. Read the Instrument section of this manual (p. 14-25a) for a description of the various features of Teach Spin PS1-B pulsed NMR spectrometer.
3. Read the Getting Started section (p. 26-35). This section outlines the procedures you willperform in lab.
Experiment in Lab:
1. Understand the capabilities of the NMR spectrometer by working through the followingsections
Section A (p. 26-27): Pulsing Sequences. Exercises 1 and 2 are especially relevant for our studies. Section B (28): Tuning of the Radio-Frequency Receiver. The resonant frequency for our instrument's magnet is 15.41 MHz.
2. Determine Width of the 90o Pulse for Mineral Oil
Section D (p. 29-30): Do both of the described options. (a) Option #1--use relation from theory (equation 25.1, p. 11) to estimate tw(90o)approximately. For our instrument B1=12 Gauss. The value for γproton is given on p. 3.
(b) Option #2-- follow this procedure to determine tw(90o) empirically.
3. Measure T2 For Mineral Oil Using The Spin Echo Method
Section H (p. 34) Measure T2 for mineral oil sample using option #1 (the two-pulse spin echo technique) described on p. 34. To set up this measurement, the width of pulse A is set to be a 90o pulse, while the width of pulse B is set to be a 180o pulse. The delay time τ between Aand B is then varied and the value of the echo height Vecho is measured for each τ. Accordingto equation 24.1, a plot of ln(Vecho) vs. 2τ yields a straight line with slope equal to 1/T2.
4. Measure T1 For Mineral Oil
Section G (p. 32-33): Measure T1 for mineral oil sample using one or more of the methods described in this section.
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