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? None of these Spin - spin relaxation Spin - lattice relaxation Spin - spin - spin relaxation None of these Spin - spin relaxation Spin - lattice relaxation Spin - spin - spin relaxation 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 nucleus spins faster The processional frequency of the nucleus increases The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field None of these The nucleus spins faster The processional frequency of the nucleus increases The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field 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? None of these To increase sensitivity To remove inaccuracies caused by fluctuations in the applied magnetic field To ensure that all target nuclei in the sample have been excited None of these To increase sensitivity To remove inaccuracies caused by fluctuations in the applied magnetic field To ensure that all target nuclei in the sample have been excited ANSWER DOWNLOAD EXAMIANS APP
FT IR Spectroscopy What does the Michelson interferometer do? Split a polychromatic beam of radiation into its component wavelengths Modulate the I.R. signal at a lower frequency, so that it can be observed by a detector Selectively filter certain wavelengths from a beam of I.R. radiation None of these Split a polychromatic beam of radiation into its component wavelengths Modulate the I.R. signal at a lower frequency, so that it can be observed by a detector Selectively filter certain wavelengths from a beam of I.R. radiation None of these ANSWER DOWNLOAD EXAMIANS APP
FT IR Spectroscopy The frequency of precession, the transition frequency and the Larmor frequency are different terms for the same frequency same terms for the same frequency different terms for the different frequency same terms for the different frequency different terms for the same frequency same terms for the same frequency different terms for the different frequency same terms for the different frequency ANSWER DOWNLOAD EXAMIANS APP
FT IR Spectroscopy How do you turn a signal recorded in the time domain into a frequency domain signal? Fourier transformation None of the above Measurement of peak areas By use of a Michelson interferometer Fourier transformation None of the above Measurement of peak areas By use of a Michelson interferometer ANSWER DOWNLOAD EXAMIANS APP
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