[en] Various methods of disposal of vitrified radioactive wastes in thick ice caps are discussed. Antarctica and Greenland are mentioned as possible sites but only Antarctica is considered in some depth. Due to uncertainty about conditions at the ice-rock interface and about ice movement in general, the author concludes that high level wastes should not be buried in ice and that a much more detailed understanding of the geophysics of the region would be required before this conclusion could be changed

[en] CH₃F, CH₃Cl, CH₃Br were seeded into Ar van der Waals clusters by means of a pulsed supersonic molecular beam. Ions formed by electron impact were observed by time-of-flight mass spectroscopy. Enhancement of the CH₂X⁺ signal relative to the CH₃X⁺ was noted. By changing the seed concentration it was shown that this was due to Ar rather than the (CH₃X)₂ dimer. These results are energetically compatible with a Penning energy transfer from Ar. Protonation of the CH₃X ions was observed related to the number of clusters containing more than one seed molecule. A difference in CH₄Cl⁺and CH₄Br⁺ production was noted. This is interesting considering the similarity of the gas-phase proton affinity of the CH₃Cl and CH₃Br