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Unformatted text preview: Problem Set 2 Answers 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] temporarily Mark Lingwood ( [email protected] ) 1. (10pts) a) The timing for the experiment: Pulse for 10 μ s (You want a 90º pulse, which is ½ your 180º pulse of 20 μ s) Acquire for 1s + (Your T 2 * is the point where your signal is 1/e of the maximum, so you should acquire a little longer than T 2 * .) Wait for 9s (5*T 1 gives the best signal, but any response that was longer than T 1 was accepted. You need to indicate somehow that this waiting time is between pulses, and includes the time you spend acquiring data) repeat b) Since the SNR from one scan is 2, and you want 5 times that (so that your SNR = 10),...
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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.
- Winter '08
- Quantum Chemistry