Hyperpolarizabilities measured for interacting molecular pairs
نویسندگان
چکیده
Hyperpolarizability ratios for molecules have been measured with 0.1% accuracy, at I = 5 14.5 nm, in the gas phase as a function ofdensity. These measurements yieldy(Hz)/y(He)= 19.55kO.03, y(Ar)/y(Hz)=1.668f0.002 and y(N~)/y(Hz)= 1.283+0.001 in the zero density limit. Pair interaction contributions, determined from the density dependence of y, are larger than predicted assuming classical multipolar interactions, and of the opposite sign. Extrapolated to liquid density, the pair interaction contributions to y are about as large as the isolated molecule contributions to y for Ar and ND
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