TRANSPORT-PROPERTIES OF NA+ IONS IN KR GAS

The transverse-diffusion coefficients, for Na+ ions drifting in Kr gas have been experimentally measured with estimated accuracies of better than 3% at E/N values ranging from 5 to 500 Td (1 Td = 10(-21) V m2) at about 303 K. In addition, elaborate calculations of the transport p roperties for the Na+-Kr system have been made by using Monte Carlo si mulations (MCS's) and the generalized Einstein-relation techniques. Th e experimental results are compared with values obtained from MCS's us ing the interaction potential of Koutselos, Mason, and Viehland [J. Ch em. Phys. 93, 7125 (1990)] as input. Agreement within 3% for the entir e range of E/N is observed in the comparisons. MCS-calculated values o f longitudinal-diffusion coefficients are also compared with those det ermined experimentally by Thackston et al. [J. Chem. Phys. 73, 2012 (1 980)].