The transfer characteristics of MOSFET exemplify that the
diffusion current governs the subthreshold region, while the drift current dominates in the linear-saturation region.
The elimination function is based on rate dependence of various currents, that is,
diffusion current, kinetic current, charging current, and so forth.
Due to anisotropy and the large ratio of [[rho].sub.[101]]/[[rho].sub.(101)], the
diffusion current along [101] axis is much larger than that along the [101] axis.
Where ai and aA are the ratios of
diffusion current at concentrations of interfering agent and analyte respectively.
In this method, the
diffusion current is proportional to the concentration of the substance, and a change in the concentration to be determined is immediately reflected in the value of
diffusion current [4-6].
where [i.sup.[alpha]] means a partial density vector of
diffusion current, e[rho]--space charge, i--total density of
diffusion current.
The principle of this method consists of measuring the limiting
diffusion current at the cathode of an electrolysis cell during an electrochemical reaction, so as to determine the mass transfer rate.
The temperature coefficient values of
diffusion current as shown in Table 1 and 2 are found to be between 1.00 to 1.56% per degree which is in agreement with the range predicted by Meites for organic molecules (Meites,1967).
These criteria are based on the polarographic
diffusion current [i.sub.d], currents at defined voltages on the rising portion of the polarographic wave, i, and the adjusted mercury head above the dropping mercury electrode, h.
In all the cases decrease in
diffusion current occurred with increasing ligand concentration.
This removes the need to evaluate ionic currents and
diffusion currents at millions of sites, and allows the use of a much lower spatial resolution (in the order of 1 mm).