ft-ir-spectroscopy biochemistry question and answers -Page 2

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FT IR Spectroscopy problems

1. The frequency of precession, the transition frequency and the Larmor frequency are
Options
A. different terms for the same frequency
B. same terms for the same frequency
C. different terms for the different frequency
D. same terms for the different frequency

2. What does the Michelson interferometer do?
Options
A. Split a polychromatic beam of radiation into its component wavelengths
B. Selectively filter certain wavelengths from a beam of I.R. radiation
C. Modulate the I.R. signal at a lower frequency, so that it can be observed by a detector
D. none of the above

3. When radiation energy is absorbed by a spin 1/2 nucleus in a magnetic field, what happens?
Options
A. The processional frequency of the nucleus increases
B. The nucleus spins faster
C. The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field
D. none of the above

5. 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?
Options
A. Spin - lattice relaxation
B. Spin - spin relaxation
C. Spin - spin - spin relaxation
D. None of these

6. Why is it advantageous to record many FID signals from the same sample and then add them together?
Options
A. To ensure that all target nuclei in the sample have been excited
B. To remove inaccuracies caused by fluctuations in the applied magnetic field
C. To increase sensitivity
D. None of the above

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