FT IR Spectroscopy The frequency of precession, the transition frequency and the Larmor frequency are different terms for the same frequency different terms for the different frequency same terms for the different frequency same terms for the same frequency different terms for the same frequency different terms for the different frequency same terms for the different frequency same terms for the same frequency ANSWER DOWNLOAD EXAMIANS APP
FT IR Spectroscopy What is the name given to the relaxation process due to an interaction between an excited nucleus and the magnetic fields caused by nuclei in molecules moving around in the sample? Spin - spin - spin relaxation Spin - spin relaxation Spin - lattice relaxation None of these Spin - spin - spin relaxation Spin - spin relaxation Spin - lattice relaxation None of these ANSWER DOWNLOAD EXAMIANS APP
FT IR Spectroscopy Why is it advantageous to record many FID signals from the same sample and then add them together? To ensure that all target nuclei in the sample have been excited To remove inaccuracies caused by fluctuations in the applied magnetic field To increase sensitivity None of these To ensure that all target nuclei in the sample have been excited To remove inaccuracies caused by fluctuations in the applied magnetic field To increase sensitivity None of these ANSWER DOWNLOAD EXAMIANS APP
FT IR Spectroscopy What is meant by rotating frame of reference? None of these If the laboratory itself is imagined to be rotated at the Larmor frequency, viewing that individual magnetic moment vectors are fixed in space That the sample is spun rapidly in the applied field That the detector rotates around the sample None of these If the laboratory itself is imagined to be rotated at the Larmor frequency, viewing that individual magnetic moment vectors are fixed in space That the sample is spun rapidly in the applied field That the detector rotates around the sample ANSWER DOWNLOAD EXAMIANS APP
FT IR Spectroscopy In FT-NMR, how are nuclei excited? By an intense pulse of radiation which contains a wide range of frequencies By radio-frequency radiation whose frequency is swept across a predetermined range By an intense pressure None of these By an intense pulse of radiation which contains a wide range of frequencies By radio-frequency radiation whose frequency is swept across a predetermined range By an intense pressure None of these ANSWER DOWNLOAD EXAMIANS APP
FT IR Spectroscopy When radiation energy is absorbed by a spin 1/2 nucleus in a magnetic field, what happens? The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field The nucleus spins faster The processional frequency of the nucleus increases None of these The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field The nucleus spins faster The processional frequency of the nucleus increases None of these ANSWER DOWNLOAD EXAMIANS APP
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