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Part of this Article is merged from Absorption spectrum : See old talk-page at Talk:Absorption spectrum - - - Steve Quinn (formerly Ti-30X) ( talk) 04:56, 9 February 2010 (UTC)
It turns out there is a much better set of articles under spectroscopy; most of what is covered here is in Ultraviolet-visible spectroscopy propose we merge/delete this into spectroscopy.
I second that.
Not all absorption techniques excite electrons; IR, for instance, only changes a molecule's vibrational energy level. It sounds like the author is also trying to include X-ray crystallography within absorption spectroscopy as well; that is also incorrect. Only IR spectra contain the "fingerprint" region mentioned in this article; UV spectra really don't provide such unique information. The analogy between calibration curves and Hooke's law is tenuous at best, and would be very confusing to someone not familiar with both topics. This page is listed under "pages needing expert attention," so my little list of inaccuracies might be a good place to start. Mihovil 19:03, 30 August 2006 (UTC)
Of course all spectroscopies "affect" the electron cloud; I never disputed that. But IR radiation absolutely does not promote electrons to higher energy levels, UV does. When a photon of infrared radiation is absorbed by the absorbing species, said species is promoted from its (usually) ground vibrational state to a higher vibrational state. Yes, the electron cloud will be polarized, but that is a matter for the Raman spectroscopist, and Raman in not an absorption technique. UV spectra of most organic molecules are basically broad Gaussian blobs, and it is very common for different molecules to have UV absorption spectra which are centered around the same wavelength. This means that it will be difficult or impossible to distinguish them on the basis of their UV spectra alone. For this reason, UV is not considered to give any "fingerprint" information. Mihovil 02:05, 31 August 2006 (UTC)
At this point, I'm really not sure if you are actually reponding to any of my comments, or just trying to demonstrate your knowledge of spectroscopy. Mihovil 00:24, 4 September 2006 (UTC)
Of course you haven't! Sorry if I sounded cranky.
Mihovil 23:50, 23 September 2006 (UTC)
Anyway, it depends on the type of spectroscopy. For example, in UV-visible spectroscopy, electrons absorb radiation, and are promoted to higher energy levels. In infrared spectroscopy, though, radiation is absorbed, but the electrons are essentially not affected. Mihovil 23:50, 23 September 2006 (UTC)
I have added an introductory paragraph and some references
Cinnamon colbert 03:54, 14 December 2006 (UTC)
I have changed the name back to absorbtion spectroscopy, as atomic absorbtion spectroscopy , at least in the USA, typically refers to techniques such as flame spectroscopy; I think most workers would consider this a different article.
I have added an introduction to try to reduce the problem of specificity. DJDahm 7, April, 2007
I'm not sure what absorption spectroscopy means when I'm reading this article. It deals primarily with UV visible spectroscopy when that topic has its own article. This doesn't make any sense. From the looks of it this article needs to get rid of the UV visible section and be clear on its purpose that distinguishes it from other spectroscopy techniques. LostLucidity ( talk) 00:55, 27 January 2008 (UTC)
I agree with many previous commenters that the current article does not clarify what is unique about absorption spectroscopy as a topic and contains so many concepts that it is confusing. I think many of the topics touched on are already dealt with well in other articles. I don't, though, think this article should be done away with. I have spent some time working on substantial changes to this article, using the articles on Raman spectroscopy and ultraviolet-visible spectroscopy as my guides. I've put a first draft of the introduction in place and also re-organized the article to show my thoughts on an appropriate organization. I'll continue working on it, and your thoughts and contributions would be greatly appreciated. ronningt ( talk) 21:52, 13 September 2009 (UTC)
There is a line in the absorption spectrum section which I find extremely confusing:
Radiation is more likely to be absorbed at frequencies that match the energy difference between two quantum mechanical states of the molecules.
If you follow the link to quantum mechanical states it still makes little to no sense. Can we simplify this a little? Paskari ( talk) 17:08, 24 April 2013 (UTC)
Not the slightest hint that any human discovered this process. What? One day an astronomer walked into the observatory, and there on the bench was a spectrometer, with an unsigned note explaining how to use it? Yep, I am being sarcastic. How about someone who knows writing a "History" section. I came here to get that information. Nick Beeson ( talk) 00:36, 28 June 2014 (UTC)
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