This article is cited in 14 papers

Laser spectroscopy

Measurement of the concentration ratio for ¹³С and ¹²С isotopes at atmospheric pressure by carbon dioxide absorption of diode laser radiation at ~2 μm

E. S. Mironchuk^a, I. V. Nikolaev^b, V. N. Ochkin^b, S. S. Rodionova^b, M. V. Spiridonov^b, S. N. Tskhai<sup>b

a</sup> Institute of Physics, National Academy of Sciences of Ukraine, Kiev
^b P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow

Abstract: The ratio of ¹²СO₂ and ¹³CO₂ concentrations in the human exhaled air is measured by the method of diode laser spectroscopy using a three-channel optical scheme and multipass cell. Unlike the previous measurements in the spectral range of ~4.3 μm with a resolved rotational structure at low pressure of selected samples, the present measurements are performed in the range of ~2 μm, in which weaker absorption bands of CO₂ reside. In this case, it is possible to employ lasers and photodetectors operating at room temperature. The thorough simulation of the spectrum with collisional broadening of lines and employment of regression analysis allow one to take measurements at atmospheric pressure with the accuracy of ~0.04%, which satisfies the requirements to medical diagnostics of ulcers.

PACS: 42.55.Px, 42.60.Jf

Received: 02.04.2008
Revised: 19.09.2008

 English version: Quantum Electronics, 2009, 39:4, 388–391

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