April27_2005_2pp

April27_2005_2pp - April 27, 2005 Exam #3: Results! Range:...

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1 April 27, 2005 ¾ Exam #3: Results! Range: Average: Median: <100 - 180 153/200 (76.5%) 167/200 2 Back to Boltzmann! ± Using Boltzmann statistics, we can determine the relative populations of each of the two spin states: N 2 /N 1 = e - E/kT E is very small (relative to optical EMR) for RF EMR •As E , N 2 /N 1 1 (so, N 2 N 1 ) •BUT: for absorbance, we want N 1 >> N 2 •If absorption rate > decay rate, not much absorbance can occur before N 1 = N 2 (saturation) •When transition is saturated, NO MORE ABSORPTION!
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3 Decay (relaxation) Processes Two decay routes (non-radiative): 1. Spin-Lattice Relaxation (T 1 ) -also called: longitudinal relaxation -due to interactions between nuclear spin states and magnetic micro environments in the sample
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This note was uploaded on 05/15/2010 for the course CHEM 221 taught by Professor Joelgoldberg during the Spring '10 term at UVM.

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April27_2005_2pp - April 27, 2005 Exam #3: Results! Range:...

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