caa a22 4500 445371390 CHVBK 20180317142948.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s00340-011-4666-1 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4666-1 Sensitive measurements of stable carbon isotopes of CO2 with wavelength modulation spectroscopy near 2 μm [Elektronische Daten] [K. Tanaka, K. Tonokura] We performed highly sensitive measurements of stable carbon isotopes of CO2 using wavelength modulation spectroscopy with a distributed feedback laser diode in the 2-μm wavelength range. Ro-vibrational transitions, which belong to the different combination bands, were selected to measure the 13CO2/12CO2 carbon isotope ratio. The δ 13C value was determined through the signals obtained in a Herriott-type multipass cell with an optical path length of 29.9m. The limit of detection for CO2 using our measurement system was 16±1 parts per billion by volume at the strongest absorption peak that is assigned to the 2ν 1+ν 3 R(16) line within the laser emitting frequency region. The 10-h long term precision was a δ 13C standard deviation of 0.24‰ (1σ) with the best suited line pairs of 12CO2 and 13CO2 and with careful temperature and pressure control in the cell. The 3-min response and high precision of this measurement allows for precise continuous measurements of stable carbon isotopes in ambientCO2. Springer-Verlag, 2011 Tanaka K. Environmental Science Center, The University of Tokyo, 7-3-1 Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan aut Tonokura K. Environmental Science Center, The University of Tokyo, 7-3-1 Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan aut Applied Physics B Springer-Verlag 105/2(2011-11-01), 463-469 0946-2171 105:2<463 2011 105 340 https://doi.org/10.1007/s00340-011-4666-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4666-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tanaka K. Environmental Science Center, The University of Tokyo, 7-3-1 Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan aut NATIONALLICENCE 700 1- Tonokura K. Environmental Science Center, The University of Tokyo, 7-3-1 Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 105/2(2011-11-01), 463-469 0946-2171 105:2<463 2011 105 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer