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2t and

The Einstein B12 value is related to Jv and c2(t) through d\c2(t)\" d t

Hence,

3h2c

The above analysis used the simplest possible expansion of the vector potential in (8). Keeping higher order terms is warranted, if the electric dipole moment matrix element in (8) is zero, in which case one must also include the «s • B term. Higher order terms in the expansion of (8) lead to electric quadrupole and magnetic dipole transitions (see below).

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