The frequency omega of the 2S sub 1/2 level increases by about a gigahertz to omega1, so the energy E = h bar omega increases to E1 = h bar omega1. E and E1 are positive valued (absolute values).
The frequency omega of the 2S sub 1/2 level increases by about a gigahertz to omega1, so the energy E = h bar omega increases to E1 = h bar omega1. E and E1 are positive valued (absolute values).