Alkaline earth and group IV oxides

The diatomic oxides of the alkaline earth and group IV elements are refractory materials for which electric resonance, preceded by a high-temperature source, is an ideal 

HF is similar to CsF, discussed earlier, except that both nuclei have spins / of 1 /2 and therefore no quadrupole moments. The effective Hamiltonian for HF employed by Weiss [86] and by Muenter and Klemperer [87] was the same as that used for CsF in equation (8.281), without the quadrupole term, but with the addition of an electric field term. In the case of DF, described later, the quadrupole term is present. In irreducible tensor form, therefore, our Hamiltonian follows equation (8.282), and is written  

In our discussion of the Stark effect for CsF, we pointed out that (8.310) vanishes unless 1 + J + J is even in the 3- j symbol with zero arguments in the lower row therefore J = J 1 of necessity, and the Stark effect is second order. We showed that the second-order Stark energy could be obtained from second-order perturbation theory, to give the well-known expression (8.279) which we repeat again  

We shall, in fact, diagonalise the matrix involving the. 1 = 0, 1, 2 and 3 rotational 

For a dipole moment of 1.826 526 D and an electric field of 1500 V cm-1 the Stark energies of the M = 0 and M = 1 levels are calculated to be 308.31 and -154.16 kHz respectively. These shifts are very small because of the large separation between the rotational levels. 

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