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Calculation of Molar extinction coefficient in gel

Printed From: Sol-Gel Gateway
Category: Sol-Gel Forum
Forum Name: Characterization Techniques
Forum Discription: Discussion on the techniques used to characterize the entire Sol-Gel process from the solution to the material
URL: http://www.solgel.com/sgforum/forum_posts.asp?TID=14
Printed Date: 25 May 2013 at 3:50am


Topic: Calculation of Molar extinction coefficient in gel
Posted By: Ginj
Subject: Calculation of Molar extinction coefficient in gel
Date Posted: 21 September 2000 at 8:59am

Please let me know how we can calculate the Molar extinction coefficient of gel matrices containing rare earth ions from its absorption spectrum. I have to use this for oscillator strength calculation.



Replies:
Posted By: M.Prassas
Date Posted: 02 October 2000 at 4:11am

One easy way to calculate OS is using the following formula:

f= (2.3*m*c²/pi*e²*N*lamba²*l)Integrale(DO(lamda)dlamda or f=2.6E21 * ( 1/ N*l*lamda²)*Integral(DO(lamda) dlamda were : N is the number of ions per cc of solid matter Lamda is the mean wavelength of the transition and l is the length of the measured sample (you have to correct that by the porosity of your gel in order to get the right number) The integral (Integ DO(lamda)dlamda) can be easily estimated by taking the area under the absorption peak under question (background corrected)

See also :J.of Appl. Phys. 79 (12), 1996 p8906


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