Dear All,

The Atmospheric Chemistry Group at the University of Wollongong uses FTIR
spectroscopy for measurement of isotopic ratios of key atmospheric gases.
Low resolution (1cm-1) FTIR spectroscopy has been used in field measurements
of the vertical profile of del-13CO2 emitted from agricultural soils.  High
resolution (0.012cm-1) FTIR has been used to determine the intramolecular
isotopic composition of N2O, that is del-15N14N16O and del-14N15N16O, and in
the near future will be applied to the simultaneous measurement of del-CH3D
and del-13CH4.  We have published results highlighting the positionally
dependent 15N fractionation during photolysis of N2O, for both photolysis in
a laboratory and in-situ stratospheric measurements using a balloon borne
FTIR spectrometer.  Intramolecular isotopic analysis of N2O emitted from a
fertilised crop under various soil moisture conditions is in progress.

Some relevant publications are:

Esler, M.B., D.W.T. Griffith, F. Turatti, S.R. Wilson, and T. Rahn, N2O
concentration and flux measurements and complete isotope analysis using FTIR
spectroscopy, Chemosphere: Global Change Science, 2, 445-454, 2000.

Esler, M.B., D.W.T. Griffith, S.R. Wilson, and L.P. Steele, Precision trace
gas analysis by FT-IR spectroscopy. 1. Simultaneous analysis of CO2, CH4,
N2O, and CO in air, Analytical Chemistry, 72 (1), 206-215, 2000.

Esler, M.B., D.W.T. Griffith, S.R. Wilson, and L.P. Steele, Precision trace
gas analysis by FT-IR spectroscopy. 2. The C-13/C-12 isotope ratio of CO2,
Analytical Chemistry, 72 (1), 216-221, 2000.

Griffith, D.W.T., G.C. Toon, B. Sen, J.F. Blavier, and R.A. Toth, Vertical
profiles of nitrous oxide isotopomer fractionation measured in the
stratosphere, Geophysical Research Letters, 27 (16), 2485-2488, 2000.

Turatti, F., D.W.T. Griffith, S.R. Wilson, M.B. Esler, T. Rahn, H. Zhang,
and G.A. Blake, Positionally dependent 15N fractionation factors in the
photolysis of N2O determined by high resolution FTIR spectroscopy,
Geophysical Research Letters, 27 (16), 2489-2492, 2000.

For a fuller description of our group's work, I encourage you to visit the
Atmospheric Chemistry, University of Wollongong website on
http://www.uow.edu.au/science/research/acrg/index.html.

Regards,

Fred Turatti
________________________
Federico (Fred) Turatti
Department of Chemistry
University of Wollongong
NSW, 2522
Australia
Ph +61 2 4221 4296
Fx +61 2 4221 4287