xz is independent of aψ. Increasing the frequency of oscillations of ψ changes aψ but does not change xz. Adding ψ/charges, changes the peak value of ψ at xz, but does not change xz.
It is likely that,
xz=aψ
only for n=1. This is without proof.
What is xz physically? If ψ can be detected, it is the radius of the sphere confining ψ. The first level of oscillations n=1 is when aψ=xz. xz, the radius of ψ determines this fundamental frequency.
xz is constrained by the resistance of space and time dimensions to ψ. When ψ is fully manifested, the particle is has no mass. This occurs when ψ oscillates between one space and one time dimension. When ψ oscillates between two space dimensions, part of the particle is mass and part of it is ψ.
Changing the resistance to ψ changes xz.
When
xz=aψ, n=1
changing temperature will change the resistance to ψ and so changes xz and thus changes aψ.
The presence of another ψ field changes xz. ψ due to the particle, gets squeezed. If the applied ψ field is oscillating then the change in xz also oscillates and thus when
xz=aψ, n=1
the fundamental frequency oscillates as aψ oscillates.
So, the application of an oscillating magnetic/electric field will oscillates the fundamental frequency of the particle.
Note: ψ is energy density, adding densities does not change the total volume; the resulting sum is still energy per unit volume.