Talk:Normalisable wave function
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"All wave functions which represent real particles must be normalisable," We should note that this is true only for bound particles. Wavefunctions of scattered particles (e.g. unbound) can be periodic (at least asymptotically) over all space and never decay even for r-> infinity. In that case other normalization techniques must be used, such as confinement to a box or dirac delta normalization.
