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A least-squares criterion for the goodness of approximate wave functions is proposed. The root-mean-square energy deviation for the six-term Hylleraas function is calculated to be 3.5 volts. It is shown that no ascending power series in the variables r h r 2 and r n can be a formal solution of the Schrodinger equation.

A scanning electron microscope study of oxide replicas of aluminum electrolytic capacitor foils has provided information on tunneling produced by a given etch. Tunnel morphology depends on microstructure of the aluminum and on etching conditions. With increasing current density in an electrochemical etch, the number of etching tunnels per unit area increases and tunnel diameter decreases. A simplified model predicts the number of tunnels per unit area and the tunnel diameter needed for maximum capacitance for a given anodic Al2O3 film thickness.

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