Explanation 1) Given: Figure 40-21 shows partial energy-level diagrams for the helium and neon atoms that are involved in the operation of a helium–neon laser. It is said that a helium atom in state E 3 can collide with a neon atom in its ground state and raise the neon atom to state E 2 . The energy of helium state E 3 (20.61 eV) is close to, but not exactly equal to, the energy of neon state E 2 (20.66 eV). 2) Explanation: Initially you feel that this is an impossible situation. The energy of helium state E3 (20.61 eV) is very close to the energy of neon state E2 (20.66 eV). When a metastable (E3) helium atom and a ground state (E0) neon atom collide, the excitation energy of the helium atom is often transferred to the neon atom, which then moves to state E2...

10th Edition

ISBN: 9781118230725

Author: David Halliday, Robert Resnick, Jearl Walker

Publisher: Wiley, John & Sons, Incorporated

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Question

Chapter 40, Problem 13Q

To determine

To give reasons:

as to how the Neon E₂ level is excited in an He-Ne laser.

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Chapter 40, Problem 12Q

Chapter 40, Problem 14Q

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