A hypothetical molecular laser works in 3 level energy system. The energies of the levels. E₁, E2, and E3 are 0 eV, 0.18 eV and 0.30 eV respectively. If the laser transition takes place between the levels E2 and E₁ find the (1) wavelength of radiation that excites the molecules for the laser action.

A hypothetical molecular laser works in 3 level energy system. The energies of the levels. E₁, E2, and E3 are 0 eV, 0.18 eV and 0.30 eV respectively. If the laser transition takes place between the levels E2 and E₁ find the (1) wavelength of radiation that excites the molecules for the laser action.