• The atoms of a certain monatomic gas have five energy levels: E1 = 0, E2 = 5.4, E3 = 8.2, E4 = 8.6, and E5 = 12.4, all measured up from E1 in eV. (a) If infrared light with wavelengths in the range from 3000 to 3200 nm shines through the gas, what transitions could it cause? If the gas was so cool that all atoms were in the ground stale, would you expect to observe these transitions? (b) Answer the same questions for UV with wavelengths from 95 to 105 nm. (c) What wavelength light could de-excite the atoms from level 3 to level 2?
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