FT IR Spectroscopy How many possible orientations do spin 1/2 nuclei have when they are located in an applied magnetic field? 6 4 3 2 6 4 3 2 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 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 The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field ANSWER DOWNLOAD EXAMIANS APP
FT IR Spectroscopy How do you turn a signal recorded in the time domain into a frequency domain signal? Measurement of peak areas None of the above Fourier transformation By use of a Michelson interferometer Measurement of peak areas None of the above Fourier transformation By use of a Michelson interferometer ANSWER DOWNLOAD EXAMIANS APP
FT IR Spectroscopy In scanning electron microscopy None of these a specimen is fixed and then coated with thin layer of a heavy metal a specimen is fixed and then coated with transition metal a specimen is not fixed and then coated with thin layer of a heavy metal None of these a specimen is fixed and then coated with thin layer of a heavy metal a specimen is fixed and then coated with transition metal a specimen is not fixed and then coated with thin layer of a heavy metal ANSWER DOWNLOAD EXAMIANS APP
FT IR Spectroscopy In FT-NMR, how are nuclei excited? None of these By an intense pulse of radiation which contains a wide range of frequencies By an intense pressure By radio-frequency radiation whose frequency is swept across a predetermined range None of these By an intense pulse of radiation which contains a wide range of frequencies By an intense pressure By radio-frequency radiation whose frequency is swept across a predetermined range 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 increase sensitivity None of these To remove inaccuracies caused by fluctuations in the applied magnetic field To ensure that all target nuclei in the sample have been excited To increase sensitivity None of these To remove inaccuracies caused by fluctuations in the applied magnetic field ANSWER DOWNLOAD EXAMIANS APP
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