Scientific Results

High-precision determination of the (CO2)-C-13/(CO2)-C-12 isotope ratio using a portable 2.008-mu m diode-laser spectrometer

Year: 2003

Authors: Gagliardi G., Castrillo A., Iannone R. Q., Kerstel E. R. Th., Gianfrani L.

Autors Affiliation: Dipartimento di Scienze Ambientali, Seconda Università di Napoli, INFM РGruppo Coordinato Napoli 2, Via Vivaldi 43, 81100 Caserta, Italy; Center for Isotope Research, Department of Physics, University of Groningen, Groningen, Netherlands

Abstract: A compact and portable diode-laser spectrometer is developed for high-precision measurements of the (CO2)-C-13 /(CO2)-C-12 isotope ratio. Ro-vibrational transitions belonging to different combination bands, around 2.008 mum, are detected for the two isotopomers, using wavelength-modulation spectroscopy with first-harmonic detection. The determination of the isotope ratio is performed through a comparison between the spectra, simultaneously acquired in two different multiple-reflection cells designed to contain the sample and reference gases. The reproducibility of our method is extensively investigated over different time scales. In particular, the short-term precision of the isotope ratio determination is found to be 0.03%. We discuss the presence of possible systematic shifts in the delta-value and optimise the operating conditions to ensure accuracy within the precision level. A possible use for in-situ measurements in volcanic gases is also discussed.


Volume: 77 (1)      Pages from: 119  to: 124

KeyWords: Band structure; Carbon dioxide; Gases; Light modulation; Semiconductor lasers; Spectroscopic analysis, Diode laser spectrometer; Isotope ratio; Multiple reflection cells; Ro vibrational transitions; Volcanic gases, Radioisotopes
DOI: 10.1007/s00340-003-1240-5

Citations: 46
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-11-21
References taken from IsiWeb of Knowledge: (subscribers only)
Connecting to view paper tab on IsiWeb: Click here
Connecting to view citations from IsiWeb: Click here

This site uses cookies. If you decide to continue browsing we consider that you accept their use. For more information about cookies and how to delete them please read our Info Policy on cookies use.
Read more