Talk:Molar absorption coefficient

message: "It is an intrinsic property of the species; the actual absorbance of a sample is dependent on its thickness L and the concentration c of the species."
Should this actually say:?
"It is an intrinsic property of the species; the actual absorption of a sample is dependent on its thickness L and the concentration c of the species."
:No, absorbance is fine, because it is a way to quantify absorption, and because the phrase refers to the distinct nature of absorbance and molar absorptivity, two different concepts that are often confused.--Nevermore78 01:29, 3 April 2006 (UTC)
replies: text:  Note that absorbance has a very specific technical definition. 128.146.32.223 (talk) 02:56, 2 September 2009 (UTC)
thread_title:  Absorbance versus absorption 

message: I've actually never used the term thickness before, should we perhaps use path length instead of thickness? Hmm. Article needs some work. Better put it on my to-do list.GreatMizuti 13:00, 3 October 2006 (UTC)
thread_title: Thickness?

message: Perhaps the units should also be listed on the main page, as is done with all other physics items listed in wiki?  Mueschke
I made a separate paragraph for units neffk (talk) 14:10, 28 May 2009 (UTC)
thread_title:  Units? 

message: IUPAC recommends that ε be called the molar (decadic) absorption coefficient.  See , , and especially .
— DIV (128.250.204.118 08:20, 7 September 2007 (UTC)
replies: text: This article should be appropriately changed. 128.146.32.223 (talk) 02:56, 2 September 2009 (UTC)

text: These links should be changed, the new IUPAC site don't have it. The new (old) links are: 10.2.1.3 Molecular spectroscopy, 10.3.5.2 Measuring techniques, and 11.2 Terms and symbols used in photochemistry and in light scattering. 148.234.94.14 (talk) 19:48, 10 March 2017 (UTC)
thread_title:  Molar (decadic) absorption coefficient 

message: Shouldn't ε and E1% be swapped in the conversion formula? It should rather be E1%=(ε*molecular weight)/10 and not vice versa.
Sachoques (talk) 20:24, 4 June 2008 (UTC)
replies: text: No, because the units don't work out that way. ε is in M-1cm-1, E1% in g-1 L cm-1, and molecular weight in g mol-1:  (mol/L)-1cm-1  =  mol-1 L cm-1 = g-1 L cm-1 * g mol-1 -- 99.153.134.31 (talk) 23:03, 14 September 2008 (UTC)
replies: text: Err... actually, after thinking about it, I'm not sure what units E1% should have (absorbances should be unitless). The general principle holds, though. Since ε is per molar, you need to get the moles in the denominator of the other side. -- 99.153.134.31 (talk) 23:27, 14 September 2008 (UTC)
thread_title: Convert between ε and E1% 

message: What is it commonly known by and what is it actually known as, as the lead is somewhat ambiguous. Per WP:COMMONNAME, the article should be located at the article title it is most commonly known. WP:CHEMNAME covers elements and compounds and not other chemistry related articles, thus this article is not covered by that naming convention. —James (Talk • Contribs) • 6:48pm • 08:48, 8 November 2011 (UTC)
thread_title:  Request for clarification 

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thread_title:  External links modified (February 2018) 

message: I have recorded or examined spectra for several decades, but I have never encountered the term "attenuation coefficient".  Never even seen the term before just a few seconds ago in my attempt to learn about extinction coefficients for IR bands.  I started a discussion on moving the title to something that practitioners actually use vs what IUPAC thinks we should use.  See Wikipedia talk:WikiProject Chemistry#Molar attenuation coefficient.--Smokefoot (talk) 21:46, 28 November 2022 (UTC)
replies: text: There is a pending proposal to move this to Molar absorption coefficient at the discussion linked above. Mdewman6 (talk) 20:21, 1 December 2022 (UTC)
thread_title: Swap article title to Extinction coefficient?