NMR Spectroscopy Quiz

Absorption of visible light

Interaction of nuclear spins with an external magnetic field

Excitation of electrons to higher energy levels

Emission of X-rays

Only nuclei with an even mass number

Only nuclei with an odd mass number

Nuclei with a nonzero spin quantum number

All atomic nuclei

It undergoes nuclear fission

It transitions between nuclear spin states

It emits fluorescence

It undergoes chemical ionization

The mass of the nucleus

The strength of the external magnetic field

The electronic environment surrounding the nucleus

The temperature of the sample

The protection of nuclei from the applied magnetic field

The reduction of the effective magnetic field experienced by a nucleus due to surrounding electrons

The removal of external interference in the NMR instrument

The excitation of nuclei to higher energy levels

CDCl₃

Tetramethylsilane (TMS)

Deuterium oxide (D₂O)

Ethanol

Increasing the temperature

Decreasing the magnetic field strength

Increasing the magnetic field strength

Using a non-polar solvent

Deuterium does not interfere with proton signals

Deuterium enhances the NMR signals

Deuterium is paramagnetic

Deuterium absorbs RF energy efficiently

Converts time-domain signals into frequency-domain spectra

Increases the intensity of NMR signals

Reduces the noise in spectra

Improves the magnetic field strength

The type of functional group

The chemical environment of the proton

The relative number of equivalent protons in that environment

The applied radiofrequency