Hello everyone,

In addition to the Excel file posted by Jordi Delago, there is a web
utility that computes stable isotope fractionations online. The
compilation comprises now more than 450 pairs of isotopic species in
the sytems of H, C, O, S. The user interface has also been updated
since the original posting in early January. The program computes the
1000 ln alpha value from the selceted equation and input temperature.
The 1000 ln alpha value is returned with the equation coefficients
and the reference (s). The program uses a general formulation:

1000 ln alpha = A (10^18/T^6) + B (10^12/T^4) + C (10^9/T^3) + D
(10^6/T^2) + E (10^3/T) + F

The URL for the Isotope Fractionation Calculator(IFC) is:

http://www.ggl.ulaval.ca/cgi-bin/isotope/generisotope.cgi

The database for the IFC program is also an Excel file that could be
made available easily either as a posting on the IFC or ISOGEOCHEM
pages. Because the IFC is updated regularly following suggestions
from stable isotope geochemsits, the datafile will have to be updated
regularly.

Good day everybody!
Dr. Georges Beaudoin, Ph.D.
Professeur agrégé
Directeur du programme de géologie
Équipe MEDEF
Département de géologie et de génie géologique
Université Laval
Québec, Qc
Canada G1K 7P4
tel. 418-656-3141
fax. 418-656-7339

Visitez ma page WEB
http://www.ggl.ulaval.ca/personnel/beaudoin/Georges.Beaudoin.html

ou celle de notre équipe de recherche, le MEDEF
http://www.ggl.ulaval.ca/personnel/medef/index.html