Isotopic ratio measurement of methane in ambient air using mid-infrared cavity leak-out spectroscopy
We report on infrared laser spectroscopic measurements of the isotopic composition of methane (CH4, CH4) in natural air samples with a cavity ring-down technique. A CO overtone sideband laser is utilized to excite a high-finesse cavity which provides an effective optical absorption path length of 3....
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| Veröffentlicht in: | Applied physics. B, Lasers and optics Lasers and optics, 2001, Vol.72 (1), p.121-125 |
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| container_title | Applied physics. B, Lasers and optics |
| container_volume | 72 |
| creator | DAHNKE, H KLEINE, D URBAN, W HERING, P MÜRTZ, M |
| description | We report on infrared laser spectroscopic measurements of the isotopic composition of methane (CH4, CH4) in natural air samples with a cavity ring-down technique. A CO overtone sideband laser is utilized to excite a high-finesse cavity which provides an effective optical absorption path length of 3.6 km. We achieved a detection limit of 105 ppt methane in ambient air using an integration time of 20 s. This corresponds to a minimum detectable absorption of 1.9X10 /cm. Rapid determination of the C/Cisotopic ratio of methane in ambient air without sample preconcentration or gas processing is realized. The present system requires only few minutes for an isotopic ratio measurement with a precision of 11%o . |
| doi_str_mv | 10.1007/s003400000509 |
| format | Article |
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A CO overtone sideband laser is utilized to excite a high-finesse cavity which provides an effective optical absorption path length of 3.6 km. We achieved a detection limit of 105 ppt methane in ambient air using an integration time of 20 s. This corresponds to a minimum detectable absorption of 1.9X10 /cm. Rapid determination of the C/Cisotopic ratio of methane in ambient air without sample preconcentration or gas processing is realized. 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We achieved a detection limit of 105 ppt methane in ambient air using an integration time of 20 s. This corresponds to a minimum detectable absorption of 1.9X10 /cm. Rapid determination of the C/Cisotopic ratio of methane in ambient air without sample preconcentration or gas processing is realized. The present system requires only few minutes for an isotopic ratio measurement with a precision of 11%o .</abstract><cop>Berlin</cop><pub>Springer</pub><doi>10.1007/s003400000509</doi><tpages>5</tpages></addata></record> |
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| source | SpringerNature Journals |
| subjects | Applied sciences Biological and medical applications Carbon monoxide Exact sciences and technology Excitation Fundamental areas of phenomenology (including applications) Global environmental pollution Holes Infrared spectrometers, auxiliary equipment and techniques Infrared, submillimeter wave, microwave and radiowave instruments, equipment and techniques Instruments for environmental pollution measurements Instruments, apparatus, components and techniques common to several branches of physics and astronomy Laser spectroscopy Lasers Methane Optics Physics Pollution Sidebands Spectroscopic analysis Spectroscopy |
| title | Isotopic ratio measurement of methane in ambient air using mid-infrared cavity leak-out spectroscopy |
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