New PDF release: Advances in Chemical Physics, Vol.2 (Interscience 1958)

By I Prigogine

ISBN-10: 0470697954

ISBN-13: 9780470697955

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By I Prigogine

ISBN-10: 0470697954

ISBN-13: 9780470697955

Show description

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Extra info for Advances in Chemical Physics, Vol.2 (Interscience 1958)

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45 are considered (since D is usually very small). 12), although the overall shape of the spectrum still remains symmetrical at this point. Variation in the intensity across the spectrum arises from the mI term, since transitions with the largest negative mI value will be broadened the least, whilst transitions with the largest positive mI value will be broadened the most. This is a very useful correlation, since it provides a means of determining the sign of aiso from the spectrum if the term in mI dominates that in mI2.

12) In general, T1e > T2e and the line width depends mainly on spin–spin interactions. T2e increases on decreasing the spin concentration, that is, the spin–spin distance in the system. On the other hand when T1e becomes very short, below roughly 10−7 sec, its effect on the lifetime of a species in a given energy level makes an important contribution to the linewidth. In some cases the EPR lines are broadened beyond detection. T1e is inversely proportional to the absolute temperature (T1e ∝ T−n) with n depending on the precise relaxation mechanism.

The phenomenon whereby the rate of increase of signal amplitude is less than directly proportional to the square root of the microwave power is known as saturation. If the relationship between signal amplitude and receiver gain is important, as in the quantitative determination of spins, it is essential that nonsaturating conditions are used during the measurements. At room temperature, very few transition metal ions will show saturation effects, and lower temperatures such as liquid nitrogen or liquid helium will be required to saturate the signal.

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Advances in Chemical Physics, Vol.2 (Interscience 1958) by I Prigogine


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