| Issue |
J. Phys. Colloques
Volume 48, Number C1, Mars 1987
VIIth Symposium on the Physics and Chemistry of Ice
|
|
|---|---|---|
| Page(s) | C1-647 - C1-648 | |
| DOI | https://doi.org/10.1051/jphyscol:1987191 | |
J. Phys. Colloques 48 (1987) C1-647-C1-648
DOI: 10.1051/jphyscol:1987191
DISPERSE DECAY KINETICS OF EXCESS ELECTRONS IN PULSE IRRADIATED FROZEN AQUEOUS GELS
J. EDEN, D. van LITH, J.M. WARMAN et A. HUMMELInteruniversity Reactor Institute, Mekelweg 15, NL-2600 GA Delft, The Netherlands
Abstract
A study has been carried out on the behaviour of excess electrons formed by nanosecond pulsed ionisation of systems consisting of water and the gelling agent kappa - carrageenan. Measurements have been made for weight fractions of carrageenan from 0.01 to 0.74 and for temperatures down to -150°C. Down to approximately -60°C electrons decay exponentially with lifetimes an order of magnitude longer than in pure, bulk ice. Below -60°C deviations from exponential decay kinetics become increasingly evident. These deviations are more pronounced the lower the water content of the sample. The disperse kinetic behaviour observed is thought to be related to the decrease in the average dimensions of the ice microcrystallites encapsulated in the gel matrix.