| http://www.w3.org/ns/prov#value | - .lamda. is the de Broglie wavelength for the approaching electron, n is an integer preferably having a value between 0 and 50 (n=0, 1, 2, . . . 50) and more preferably having a value between 0 and 16 (n=0, 1, 2, . . . 16) and still more preferably
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