NDLI: Diode laser absorption spectrometry for 13CO2/12CO2 isotope ratio analysis: Investigation on precision and accuracy levels

Content Provider	Springer Nature Link
Author	Castrillo, A. Casa, G. Kerstel, E. Gianfrani, L.
Copyright Year	2005
Abstract	Near-infrared laser spectroscopy is used to measure the 13C/12C isotope abundance ratio in gas phase carbon dioxide. The spectrometer, developed expressly for field applications, is based on a 2 μm distributed feedback diode laser in combination with sensitive wavelength modulation detection. It is characterized by a simplified optical layout, in which a single detector and associated electronics are used to probe absorptions of a pair of 13CO2 and 12CO2 lines, simultaneously in a sample, as well as a reference gas. For a careful investigation of the achievable precision and accuracy levels, we carried out a variety of laboratory tests on CO2 samples with different isotopic compositions, calibrated with respect to the international standard material by means of isotope ratio mass spectrometry. The 1-σ accuracy of the 13CO2/12CO2 determinations, reported in the so-called δ notation, is about 0.5‰ (including both statistical and systematic errors), for δ-values in the range from -30‰ to +20‰. We show that the major source of systematic errors is a consequence of the non-linearity of the Lambert–Beer absorption law, and can be corrected for to a very high degree of accuracy.
Starting Page	863
Ending Page	869
Page Count	7
File Format	PDF
ISSN	09462171
Journal	Applied Physics B
Volume Number	81
Issue Number	6
e-ISSN	14320649
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-09-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physics and Applied Physics in Engineering Optical Spectroscopy, Ultrafast Optics Quantum Optics, Quantum Electronics, Nonlinear Optics Laser Technology and Physics, Photonics Physical Chemistry Electromagnetism, Optics and Lasers
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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