Science > Physics > Emission VS absorption band for CO2 near 4.3 microns
| Topic: |
Science > Physics |
| User: |
"PlanckQ" |
| Date: |
21 Oct 2005 08:44:34 AM |
| Object: |
Emission VS absorption band for CO2 near 4.3 microns |
Emission VS absorption band for CO2 near 4.3 microns
Hello All,
In a thesis by Andreas Pettersson that is posted on the internet
(http://www.forbrf.lth.se/htmlavd/x_job/AndreasPetterssonExamensarbete...)
he states on page 41 that
"..a shift towards longer wavelength exists for the emission peak [CO2]
compared to the well known absorption peak."
Is this statement correct? I always thought that absorption peaks
coincide with emission peaks. ie. photons absorbed at a certain
wavelength are eventually re-emitted at the same wavelength. If his
statement is
plausible what is the explanantion? Is there a good textbook on this
topic?
Thanks,
Pete
.
|
|
| User: "Androcles Androcles@ MyPlace.org" |
|
| Title: Re: Emission VS absorption band for CO2 near 4.3 microns |
21 Oct 2005 09:02:16 AM |
|
|
"PlanckQ" <engpete@hotmail.com> wrote in message
news:1129902274.243273.26510@g44g2000cwa.googlegroups.com...
| Emission VS absorption band for CO2 near 4.3 microns
|
| Hello All,
|
| In a thesis by Andreas Pettersson that is posted on the internet
|
(http://www.forbrf.lth.se/htmlavd/x_job/AndreasPetterssonExamensarbete...)
| he states on page 41 that
|
| "..a shift towards longer wavelength exists for the emission peak
[CO2]
| compared to the well known absorption peak."
|
| Is this statement correct? I always thought that absorption peaks
| coincide with emission peaks. ie. photons absorbed at a certain
| wavelength are eventually re-emitted at the same wavelength.
Not so, and no reason for it to be so.
Certainly not true in fluoresence.
http://en.wikipedia.org/wiki/Fluorescence
"Fluorescence is a luminescence which is mostly found as an optical
phenomenon in cold bodies, in which a molecule absorbs a high-energy
photon, and re-emits it as a lower-energy (longer-wavelength) photon".
Androcles.
If his
| statement is
| plausible what is the explanantion? Is there a good textbook on this
| topic?
|
| Thanks,
|
| Pete
|
.
|
|
|
|
|
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