The energy of the free electron.

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Chapter 34, Problem 62P

To determine

The energy of the free electron.

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In a He-Ne gas laser an electrical discharge pumps helium atoms to a 20.61 eV excited state. This excited helium level is very close to a 20.66 eVlevel in neon, so that upon collision of a helium atom and a neon atom, the energy can be transferred from the He to the Ne atom. From this excited state, the neon atom then drops toa lower 18.70 eV state thereby emitting a photon. What is the wavelength of this photon?

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