By David S. Betts
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Additional info for Core Electromagnetics (Master's Series in Physics and Astronomy)
The cluster production source may itself generate ions. (b) Cluster stability (SN). e. a ‘magic number’), relative to similarly sized clusters. How the increased abundance of the more stable clusters comes about depends on the operating conditions (mentioned above) in the source and the nozzle conditions. 16) An identical distribution is predicted by the quasi-equilibrium model of de Heer and co-workers, in which the cluster abundance reflects the quasi-equilibrium distribution in the nozzle region, which is rapidly frozen by the adiabatic supersonic expansion.
The vaporized material (a plasma with a temperature of around 104 K) is introduced into a pulse of cold helium, which rapidly cools the vapour and induces cluster formation. The adiabatic cooling occurs at a greater rate than for the seeded supersonic nozzle and temperatures of under 100 K can be produced. Further evaporative cooling can then occur. The use of a laser for cluster generation also leads to some cluster ionization, so this source generates neutral, cationic and anionic clusters. 4 Pulsed-Arc Cluster Ion Source (PACIS) PACIS sources are closely related to laser vaporization sources, but the cluster material is instead vaporized by an intense electrical discharge.
It has also been found, however, that when the electron transfer process is strongly exothermic the neutral cluster is generated in an excited state and readily undergoes fragmentation. A detailed study has been made of the re-neutralization of sodium clusters by caesium atoms: where it was found that the main products of the re-neutralization were NaN, NaN-1 and NaN-2. 13 eV) so the cross-section for electron transfer is high, while that for fragmentation is small. The advantages of the re-neutralization approach over cluster beam deflection are that it can be applied to all cluster sizes and it produces more intense neutral beams.