Consider a symmetric rectangular double-well potential: 00 for|x|>a+b; V: O fora 0 for |x|

Consider a symmetric rectangular double-well potential: o for IXI > a + b; fora < IXI < a+b; VO>O for IXI < a. Assuming that Vo is very high compared to the quantized energies of low-lying states, obtain an approximate expression for the energy splitting between the two lowest-lying states.