RELATIVE DISPERSION OF THE 2ND REFRACTIVITY VIRIAL-COEFFICIENT OF XENON BETWEEN 633 NM AND 325 NM MEASURED FOR TEMPERATURES UP TO 1100 K

We report measurements of the difference of the reduced second refract ivity virial coefficient Delta B(T) = B-R(325.13 nm, T)/A(R)(325.13 n n, T)-B-R(632 99 nm, T)/A(R)(632.99 nm, T) of xenon in the temperature range between 295 g and 1100 K. A(R)(lambda, T) and B-R(lambda, T) ar e the first and second refractivity virial coefficients measured at la mbda = 325.13 nm and lambda = 632.99 MI respectively. Delta B(T) is f ound to decrease with increasing temperature T as 10(7) Delta B(T)/m( 3) mol(-1) = 12.6(6.8)xexp[-0.0038(13)x(T/K)] with a standard deviatio n of 0.94x10(-7) m(3) mol(-1). With the aid of one absolute value of B -R(lambda, T) and calculations based on an extended dipole-induced-dip ole model, a normal dispersion of B-R(lambda, T) is found throughout t he whole temperature range. This result is contrary to former room-tem perature measurements, where an anomalous dispersion of B-R(lambda, T) of xenon has been reported.