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Unformatted text preview: Problem 1: (6 points) Why did the application papers distributed in lecture 1 focus exclusively on solid state QR spectroscopy? Is it possible to obtain a pure QR spectra from a liquid? Problem 2: (6 points) Discuss three reasons why QR spectra are frequently acquired with the sample cooled to 77 K. Problem 3: (6 points) Drawing from the distributed journal articles, state several advantages and disadvantages of the exceptional sensitivity of quadrupole resonance transition frequencies to variations in the electric Feld gradient tensor. Problem 4: (6 points) Why does increasing the excitation level ultimately decrease the power absorbed by quadrupo-lar nuclei in a CW spectrometer? Problem 5: (6 points) Consider a material that admits a QR response to both the SORC and SLSE pulse sequences. Under what conditions are the responses from the SORC and SLSE pulses sequences identical?...
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- Spring '07