Addendum to Homework5

Addendum to Homework5 - evolution. b) Calculate the phase...

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Problem Set 5 Chemistry 154A/254A: Quantum Chemistry Professor Song-I Han Teaching Assistant: Wang, Xiqing (Francis) Office: Chemistry 3223 Office: Chem 1126/ Dahlquist Lab (1 th floor) Office hours: Tue, Th 4-5 pm Office hours: Wed 1-2 pm and Fr 4-5pm Email: [email protected] Email: [email protected] ADDENDUM FOR PROBLEM-2 2. In problem 2, a spin-echo experiment is being performed on the chemical system for which the spectrum is shown. The pulse sequence is: with τ = 100ms. a) Draw the magnetization vectors for each component of the NMR spectrum (i.e. peaks a, b and c) on a vector diagram at the time just after the 90º pulse. Please think in terms of phase differences between peaks a, b versus c, not in terms of absolute phase
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Unformatted text preview: evolution. b) Calculate the phase evolution of each component (a, b, and c) after time τ , just before the 180º pulse. Now, calculate the phase difference picked up by components a versus b and a versus c. Also, d raw the effects on a separate vector diagram. c) Repeat part (b) for the time immediately following the 180º pulse. d) Repeat part (b) for the time where the echo amplitude is maximal. You can either use absolute phase or phase differences picked up by the three frequency components. It may be easier to put your arguments forward by using phase differences. Illustrate the results by means of vector diagrams....
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This note was uploaded on 08/06/2008 for the course CHEM 154A taught by Professor Han during the Winter '08 term at UCSB.

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