Associative ionization

The conductance of sodium diethyldithiocarbamate (NaDDC) has been measured in acetonitrile-water mixtures at 25°C where the dielectric constant (D) ranges from 46.52 up to 74.66. Using Fuoss-Onsager theory, the data was interpreted to obtain Λ o , K A and å values. For NaDDC, the ion parameter å (express the solvation) and limiting equivalent conductance Λ o decrease with decreasing the dielectric constant of the medium until it reaches a minimum and then increases again. The increase in log K A versus 1/D plot shows the dominance of electrostatic interaction. By applying the solvent separated – ion pair model, the association constant (K A) is analyzed.

Coherent control theory is applied to the control of Ne*
3s , 3P2+Ar
1S0 collisions and
computations are shown that display extensive control over these processes. Indeed we demonstrate
that it is possible to essentially turn on and off the cross sections for both the Penning and
associative ionization processes. This facility arises from the interference between matter waves
induced by creating a linear superposition of the degenerate M=−2,−1,0,1,2 Zeeman sublevels
of the Ne*
3s , 3P2 target atom. The computations, conducted at collision energies in the
1–8 kcal/mole range, are based on combining, within the “rotating atom approximation,”