DISPERSION OF THE REFRACTIVE-INDEX OF CADMIUM VAPOR AND THE DIPOLE POLARIZABILITY OF THE ATOMIC CADMIUM S-1(0) STATE

We report measurements of the frequency dependence of the refractive index and polarizability of cadmium vapor in the frequency range between omega=0.045 and 0.091 a.u. The quasicontinuous refractive index spectra have been measured at T approximate to 1050 K with a high-temperature Michelson interferometer using the technique of dispersive Fourier-transform spectroscopy. The dispersion of the dipole polarizability alpha(omega) of Cd obtained in our experiments can be represented as alpha(omega)=alpha(0)omega(0)(2)/(omega(0)(2)-omega(2)), with a static polarizability of alpha(0)=(49.65+/-1.46+/-0.16) a.u. and an effective transition frequency of omega(0)=(0.250 61+/-0.000 23) a.u. In addition, these measurements yield approximations for the dispersion interaction energy constant C-6=466 a.u. and the second hyperpolarizability gamma(0)=1.1x10(5) a.u.