I am currently reading about matter waves and electron traps.(adsbygoogle = window.adsbygoogle || []).push({});

the textbook states, by the equation:

hf = [tex]\Delta[/tex]E = E_{high}- E_{low}

If an electron confined to a one-dimensional infinite potential well is to absorb a photon, the energy hf of the photon must equal the energy difference [tex]\Delta[/tex]E between the initial energy level of the electron and a higher level.

Then as an aside, the textbook states:

Although the above equation and what we have discussed about photon absorption and emission can be applied to physical (real) electron traps, they actually cannot be applied to one-dimensional (unreal) electron traps. The reason involves the need to conserve angular momentum in a photon absorption or emission process.

I do not understand this statement about angular momentum.

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# Trapped Electrons

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