lesson 1 - intro to nmr

resonance in terms of nmr

when nuclei flip between the alpha and beta-spin state in response to rf radiation; when nuclei flip spin states in response to a pulse of rf energy, the energy absorbed is measurable and produces a signal

The strength of the magnetic field is __ to the operating frequency.

directly proportional — the field strength is directly proportional to the operating frequency, so a more powerful magnet operates at a higher frequency; a higher frequency increases delta E of the alpha and beta-spin states, improving the resolution of the signals

protons in an electron-rich environment are more/less shielded?

more shielded

protons in a more shielded (electron-rich) environment appear at higher/lower frequencies?

lower frequencies

protons in an electron-rich environment appear upfield/downfield, which is on the left/right side of the NMR spectrum:

upfield; right