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We all know that the alkali metals give solvated electrons in liquid ammonia which is responsible for the blue color of the solution.

It is stated, "the blue color of the solution is due to the ammoniated electron which absorbs energy in visible region of light."

But i couldn't understand why solvated electron is absorbing energy?

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    $\begingroup$ Interesting question! These are different, but related questions: What is happening in this video of solvated electrons donated from sodium in ammonia? and also How to think of solvated electrons? $\endgroup$ – uhoh Jul 23 at 2:01
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    $\begingroup$ A solvated electron is not a free electron in a vacuum. It is associated with the solvent as the name indicates. $\endgroup$ – M. Farooq Jul 23 at 2:36
  • $\begingroup$ @M.Farooq Now I want to ask if an electron in a dense plasma can be thought of as solvated ;-) Something like "Are dense, partially ionized plasmas also solutions?" $\endgroup$ – uhoh Jul 23 at 3:51
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    $\begingroup$ Basically the cage of solvent and the electron are bound. This entity has its own energy levels and, at least at a basic level, you shouldn't wonder it has specific transitions $\endgroup$ – Alchimista Jul 23 at 11:05
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    $\begingroup$ Is it that the solvated electron appears to go around absorbing energy from the environment? Rather, consider that the solvated electron just sits there (stably, in the dark), but when white light illuminates it, it can jump to a higher energy state by absorbing some of the red light from the white, leaving blue light to be seen by the observer. $\endgroup$ – James Gaidis Jul 23 at 14:33

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