So if energy levels, or eV of electrons, do not change with molecular bonding, h

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Offline Nicholas Lee

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So if energy levels, or eV of electrons, do not change with molecular bonding, how are electrons influencing each other.?
In glass, when individual atoms of silicon, sodium, and calcium come together, to form glass, the molecular bonding does not change the energy levels of the electrons for glass to transmission, light.
Someone told me glass" the atoms, or electrons are influencing each other".
What does influencing each other meanmean.
What changes the eV of the electrons specifically for light to transmission, through glass.
I am grateful for your help, anything helps even a few words. [:D]
« Last Edit: 22/05/2016 03:53:08 by Timemachine2 »

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Offline chiralSPO

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The issue here is not really what energy level the electrons are in. It is the difference in energy between occupied and unoccupied levels. The only ways to change this are:

1) Change the organization of the atoms (do a chemical reaction--like converting graphite to diamond, or oxidizing a dye with bleach)

2) Move all of the electrons from one of the occupied energy levels to an unoccupied energy level. This will take a lot of energy, and will result in only a short-lived effect because the electrons will either fall back down to the lower energy level, or the substance will fall apart (or explode). Also this will only change which frequencies are absorbed. For instance: imagine some substance that has occupied levels at 4 eV, 3.2 eV, and 2.9 eV; and unoccupied levels at 2.1 eV, 1.3 eV and 0.8 eV. It will then absorb photons with energies of 1.9 eV, 2.7 eV, 3.2 eV, 4 eV (from the 4 eV level), 1.1 eV, 1.9 eV, 2.4 eV, 3.2 eV (from the 3.2 eV level), 0.8 eV, 1.6 eV, 2.1 eV and 2.9 eV (from the 2.9 eV level)

or all together has a spectrum of:
0.8
1.1
1.6
1.9 (x2)
2.1
2.4
2.7
2.9
3.2 (x2)
4.0

If you promote all of the electrons from the 2.9 eV level to the 2.1 eV level you will only lose 0.8 eV, 1.1 eV, 1.6 eV, 2.1 eV, 2.9 one of the 1.9 eV transitions, and gain 1.1 eV, 0.3 eV, 0.8 eV, 1.5 eV, and 2.1 eV resulting in a spectrum of:
0.3
0.8
1.1
1.5
1.9
2.1
2.4
2.7
3.2 (x2)
4.0

Which is obviously still going to be absorbing!