The figure shows the electron energy level diagram during a collision between a

Question

The figure shows the electron energy level diagram during a collision between a helium and a neon atom, which occurs in helium-neon lasers. A population of electrons is created in the metastable state in neon via collisions with helium containing an electron in the excited state - this excess of electrons in an excited state is called "population inversion".

A) What is the energy, in electron volts, of the photon emitted when an electron in neon goes from its metastable state to the one immediately below?

B) What is the wavelength of this radiation in nanometers?

C) What wavelength, in nanometers, is emitted when the electron in neon makes a direct transition to its ground state?

Explanation / Answer

A) The energy of the photon emitted when an electron in neon goes from its metastable state to the one immediately below = 1.96 eV

B) Wavelength = L = 1240/1.96 = 632.65 nm

C) The wavelength when the electron in neon makes a direct transition to its ground state = 1240/20.66 = 60.02 nm

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