Using the sequential theory of resonant tunneling, the dc current-voltage characteristic of a double-barrier structure is calculated, taking into account the effect of space charge in the quantum well. A region of current bistability is found over a voltage range which is determined by the maximum space charge and the capacitance of the structure. These parameters are directly related to the periodicity of magnetoquantum oscillations in the current.

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cent experiments in this laboratory 7 on the gastemperature dependence of the angle-averaged sticking coefficient s for H 2 on W(110) and on the isotope effect for s between H 2 and D 2 . A calculation using the square-well potential and quantized motion of the surface atoms gives the correct form for s(

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