Absorption of what? If you’re talking about photons, strictly speaking they are not described by Schroedinger’s equation at all (it applies to massive, non-rela

Absorption of what? If you’re talking about photons, strictly speaking they are not described by Schroedinger’s equation at all (it applies to massive, non-relativistic particles). The double-slit experiment is often discussed in quantum mechanics in terms of matter waves (having interferences in light is not particularly surprising anyway).