Possible new frequency shifts for the 2S1/2→2P1/2transition in a hydrogen atom within a specific boundary

Changes in the frequency of the 2$S_{1/2}$→2$P_{1/2}$ transition in hydrogen when the atom is placed between two parallel, perfectly conducting plates are investigated. It is shown that the transition frequency depends on the distance between the plates and that a change in the frequency of Δν=-0.894 MHz results for plates separated by 1 μm. This is sufficiently large to be measurable.