The responsivity of the tungsten-nickel point contact diodes for the CO2 laser is investigated as functions of the contact pressure and the oxide thickness on the nickel post in order to determine the detection mechanisms of point contact MIM diodes at 10.6 µm. The data are compared with the current-temperature (I–T) characteristics and the theory based on the equivalent circuit model. A comparison of the above data and the I–T characteristics indicates that the point contact MIM diode acts as a tunnel diode. It is confirmed, from a comparison of the above data and the theory based on the equivalent circuit model, that the MIM diode operates as a square-law detector for the CO2 laser.

Absback.We performed a least-squares fit for crystal potentials derived by APW band structure calculations for monatomic, as well as diatomic, structures. The potential is described by an eighth order polynomial multiplied by an exponential function. The fitted potentials yield eigenvalues, for a variety ofk points, within 2-3 mRyd of the first-principles APW results We have also discovered that starting with the fitted potential at a given lattice constant and using the potential in the interstitial region (muffin-tin zero) as a single

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