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Squaring this we get cos2 © + 2cos © sin © + sin2 © = 1 + 2cos © sin © = 1 + sin2 ©. From weak coupling to Av = 0 the angle © goes from 0 to 45° and the intensity of the inner lines goes from 1 to 2. The same result is obtained for line 3, the other "inner" line of the AB system. These intensities are shown in Fig. 10.38.

10.8.2 The Commutator and the Evolution of Non-Stationary States

Consider the effect on Ha and Hb of the B\ field placed on the x' axis during a pulse. The Hamiltonian can be represented as yBi (Ix +l£); using the matrix operators and adding them together:

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