Relative dispersion of the second refractivity virial coefficient of xenon between 633 nm and 325 nm measured for temperatures up to 1100 K

摘要

We report measurements of the difference of the reduced second refractivity virial coefficient ΔB~*(T) = B_R(325.13 nm, T)/A_R(325.13 nm, T)-B_R(632.99 nm, T)/A_R(632.99 nm. T) of xenon in the temperature range between 295 K and 1100K. A_R(λ,T) and B_R(λ,T) are the first and second refractivity virial coefficients measured at λ = 325.13 nm and λ = 632.99 nm respectively. ΔB~*(T) is found to decrease with increasing temperature T as 10~7 ΔB~*(T)/m~3 mol~(-1) = 12.6(6.8) x exp[-0.0038(13) x (T/K)] with a standard deviation of 0.94 x 10~(-7) m~3 mol~(-1). With the aid of one absolute value of B_R(λ, T) and calculations based on an extended dipole-induced-dipole model, a normal dispersion of B_R(λ, T) is found throughout the whole temperature range. This result is contrary to former room-temperature measurements, where an anomalous dispersion of B_R(λ, T) of xenon has been reported.