NMR Spectroscopy (Griffith)
- Page ID
- 296065
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NMR – Larmor Frequency and Saturation:
- Calculate the Larmor frequency for the 1H nucleus in an NMR with a Bo = 4.69 Tesla.
- What is the ratio between 1H nuclei occupying the β versus α states in the 500 MHz Willamette NMR at 25 °C?
Constants/Tables:
| Nucleus | Magnetogyric Ratio, radian T-1 s-1 | Isotopic Abundance, % | Relative Sensitivitya | Absorption Frequency, MHzb |
|---|---|---|---|---|
| 1H | 2.6752 × 108 | 99.98 | 1.00 | 200.00 |
| 13C | 6.7283 × 107 | 1.11 | 0.016 | 50.30 |
| 19F | 2.5181 × 108 | 100.00 | 0.83 | 188.25 |
| 31P | 1.0841 × 108 | 100.00 | 0.066 | 81.05 |
aAt constant field for equal number of nuclei.
bAt a field strength of 4.69 T.
© 2007 Thomson Higher Education
From: Principles of Instrumental Analysis, 6th Edition, D.A. Skoog, F.J. Holler, S.R. Crouch, 2007, Thomson Brooks/Cole
h = 6.626 × 10-34 J s
k = 1.38 × 10-23 J K-1
c = 2.997 × 108 m/s (in a vacuum)
1T = 104 G = 1 kg s-2 A-1 = 1 V s m-2
Contributors and Attributions
- David Griffith, Willamette University (dgriffit@willamette.edu)
- Sourced from the Analytical Sciences Digital Library