Contribution of field emission in spark gap switch to N2 laser output was studied. The field emission current-spikes appeared remarkably in pressurized spark gap switch with decreasing separation of the gap between electrodes. This field emission current steepened the build-up of discharge current by pre-ionizing the atmosphere in the spark gap chamber. Due to this effect, N2 laser power increased with decreasing separation of the spark gap between electrodes and the laser pulse width decreased at the same time. As a result, a one nanosecond pulse with peak power of 120kW was generated for the first time for low pressure-operating, compact N2 laser. Furthermore, an optical method for observing the temporal behavior of the gap switch in the early stage of the build-up of discharge was also tested.
Thin oxide growth kinetics for Rapid Thermal Oxidation (RTOx) of silicon using halogen lamp at 1050 to 1300°C in a dry 02/N2 mix-ture is experimentally studied. It is first found that the RTOx at 100% O2 ambient can be explained by the Deal-Grove oxidation law and the RTOx at 3% O2 (diluted by N2) ambient by the Mott-Cabrera oxidation law. However, observed RTOx activation energies are rather different from conventional furnace oxidation. This indicates that optical excitation or other transient physical processes may play an important role.
Polythiophene derivatives substituted with long hydrocarbon were, for the first time found to be moldable by heating in conducting polymers. The molded polymer, for example a hot pressed film, has indicated remarkable enhancement in conductivity upon doping, resulting in the insulator-metal transition. By utilizing this moldable conducting polymer it has become possible to join conducting polymers, which has also demonstrated a remarkable doping effect.