Originally Posted by Farsight I'm afraid it is, Pete. You can diffract electrons. 
Your fear is for not. I made no mistake whatsoever. Recall
The Copenhagen interpretation (See
http://en.wikipedia.org/wiki/Copenhagen_interpretation)
The Copenhagen interpretation is one of the earliest and most commonly taught interpretations of quantum mechanics. It holds that quantum mechanics does not yield a description of an objective reality but deals only with probabilities of observing, or measuring, various aspects of energy quanta, entities that fit neither the classical idea of particles nor the classical idea of waves.
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The Copenhagen Interpretation denies that the wave function is anything more than a theoretical concept, or is at least noncommittal about its being a discrete entity or a discernible component of some discrete entity.
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Throughout much of the twentieth century the Copenhagen interpretation had overwhelming acceptance among physicists. Although astrophysicist and science writer John Gribbin described it as having fallen from primacy after the 1980s,[21] according to a poll conducted at a quantum mechanics conference in 1997,[22] the Copenhagen interpretation remained the most widely accepted specific interpretation of quantum mechanics among physicists. In more recent polls conducted at various quantum mechanics conferences, varying results have been found.

However you won't find a text that uses anything other than the Copenhagen interpretation.
The Copenhagen interpretation states the following
The probability of finding the particle in the interval dx = = <xPsi>^2 = Psi(x)^2 dx

where the notation Psi(x) is defined as Psi(x) = <xPsi>
In any case you're confusing the wave properties of electrons with a mathematical tool used to describe the probability density of finding the electron at a particular place in space. Watch the video at
http://physicsworld.com/cws/article/...narealthing
Just because I said that the wave function is not a real thing that has an existance which is measurable you can't logically take that to mean that wave phenomena doesn't exist. What you just said and what you're thinking is a very wellknown and very common mistake made by amateurs and beginners. You should pick up and carefully rear a good textbook on quantum mechanics. E.g. the following textbook is used at MIT to teach QM 
Introduction to Quantum Mechanics  Second Edition by David J. Griffiths, (2005).