MODEL RELEASED. NMR chemical spectroscopy: scientists working with a nuclear magnetic resonance (NMR) spectrometer. The NMR fingerprint spectrum of the sample under investigation,a carboxylic acid,appears as the series of peaks on the screen. NMR depends on certain nuclei having the nuclear property of "spin",the ability to generate a small magnetic field. When placed within a strong magnetic field,such nuclei wobble (precess) at a particular frequency,which varies according to environment. This is exploited in analytical chemistry,where protons in different groups display differing precession frequencies | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Holmes, James / Celltech |
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