The mobility and the diffusion tensor have been calculated for He+ ions in He and Ne+ ions in Ne, at temperatures of 77-78 and 294 K, and at field-to-density values E/no up to 2000 Td. For He+ ions in He, ab initio potentials were used, with a careful extrapolation to large distances. A slight adjustment of the mean potential resulted in agreement between calculated mobilities and the best experimental values to better than 0.5%. For Nef ions in Ne, a potential model with three adjustable parameters was constructed, and an overall agreement between measured and calculated mobilities to better than 1 was obtained. The model potentials probably give a good estimate of the gerade-ungerade splitting at internuclear distances from 7.5 to 10 au, but are not expected to be accurate at shorter distances .

No abstract

A new approach to the calculation of ion swarm parameters has been developed, based upon a Kramers-Moyal expansion of the Boltzmann collision integral, and has made it possible to avoid the convergence problems associated with the so-called two-and three-temperature theories. The new approach has been used, together with new experimental data, to investigate the 'Li+-He and 'Li+-Ar systems. For the 'Li+-He system, excellent agreement is found between the experimental data and data calculated from a recent ab inirio potential. For the 'Li+-Ar system, a similarly good agreement is found when the best available ab initio potential is modified in a direction indicated by theoretical considerations.

Sex differences in jealousy responses to sexual and emotional infidelity are robust in samples of heterosexual adults, especially in more gender egalitarian nations. However, investigations of when and how these differences develop have been scant. We applied two forced choice infidelity scenarios in a large community sample of high school students (age 16–19, N = 1266). In line with previous findings on adults using the forced choice paradigm, adolescent males found the sexual aspect of imagined infidelity more distressing than adolescent females did. Nevertheless, there was no effect of age on the jealousy responses, and age did not moderate the sex difference. There were neither any effects of three covariates (having had first sexual intercourse, being in a committed romantic relationship, and sociosexuality), neither as markers of pubertal maturation nor as psychosocial environmental stimuli. Future research needs to investigate even younger samples in order to specify at what age the sex difference in jealousy responses emerges.

No abstract.