caa a22 4500 44536940X CHVBK 20180317142941.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s00340-011-4602-4 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4602-4 High precision measurements of the 13CO2/12CO2 isotope ratio at atmospheric pressure in human breath using a 2 μm diode laser [Elektronische Daten] [S. Andreev, E. Mironchuk, I. Nikolaev, V. Ochkin, M. Spiridonov, S. Tskhai] A special technique is developed to measure the 13CO2/12CO2 isotope ratio in human breath at atmospheric pressure with a 2μm tunable diode laser. The procedure used to process the pressure-broadened spectra obtained and calculating the isotope ratio is based on a multidimensional linear regression of the spectra using simulated 13CO2, 12CO2, and H2O spectra. This technique allows the measurement of the δ-value for isotopic ratios with a precision of 0.07‰ within a data acquisition time of 3min and a long-term reproducibility of 0.2‰. Springer-Verlag, 2011 Andreev S. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prosp. 53, 119991, Moscow, Russia aut Mironchuk E. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prosp. 53, 119991, Moscow, Russia aut Nikolaev I. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prosp. 53, 119991, Moscow, Russia aut Ochkin V. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prosp. 53, 119991, Moscow, Russia aut Spiridonov M. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prosp. 53, 119991, Moscow, Russia aut Tskhai S. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prosp. 53, 119991, Moscow, Russia aut Applied Physics B Springer-Verlag 104/1(2011-07-01), 73-79 0946-2171 104:1<73 2011 104 340 https://doi.org/10.1007/s00340-011-4602-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4602-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Andreev S. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prosp. 53, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Mironchuk E. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prosp. 53, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Nikolaev I. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prosp. 53, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Ochkin V. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prosp. 53, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Spiridonov M. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prosp. 53, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Tskhai S. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prosp. 53, 119991, Moscow, Russia aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 104/1(2011-07-01), 73-79 0946-2171 104:1<73 2011 104 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer