MadSci Network: Physics

Subject: Atom Photon Absorption and Emission Energy

Date: Thu Apr 12 09:57:38 2007
Posted by Rich
Grade level: undergrad School: No school entered.
City: No city entered. State/Province: No state entered. Country: No country entered.
Area of science: Physics
ID: 1176397058.Ph

I have been reading about atoms absorption and emission of photons and have 
come across some possible contradictions that I was wondering if you would 
clarify. I have read that if an atom is excited by a photon with a frequency 
and wavelength equal to an electron energy and gap it will excite the electron 
to a higher orbital. Then after about ~10 nanoseconds it will decay and emit a 
photon of equal wave length/frequency/energy. I was wondering if this emission 
is the same wave length, frequency, energy as the absorbed wavelength. The 
atom is not part of a molecule and for example it is a copper or iron atom. I 
have read that there is secondary loses that could be associated with atom 
recoil, vibration (Dissipation as heat). So I was wondering if given a plate 
of iron or copper that has a light beam shined at it where the photons excite 
the atoms to jump the band gap, is the emission (one emission out of metal 
plate, the other into a adjacent atom) the same in as out (any lost energy)? 

Re: Atom Photon Absorption and Emission Energy

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