Description: Das Projekt "Entwicklung eines Quantenkaskadenlaser Spektrometers zur kontinuierlichen Bestimmung von Methan Isotopen" wird vom Umweltbundesamt gefördert und von Eidgenössische Materialprüfungs- und Forschungsanstalt, Abteilung Luftfremdstoffe,Umwelttechnik durchgeführt. influences the abundance of ozone and the concentration of hydroxyl radicals which impacts virtually all of atmospheric chemistry.4 in promoting global warming. Furthermore, CH2) is the second most important of the anthropogenically influenced greenhouse gases. On a per-molecule basis it is 25 times more effective than CO4Methane (CH The total global methane emissions are relatively well known but the strength of each source component and their trends are not. Since the major source categories and the OH sink have distinct isotopic signatures in d13 and 4C-CHd4D-CH, high-frequency and high-precision measurements of these parameters would help constraining emission sources and the global budget. However, isotope-ratio mass-spectrometry (IRMS), the standard analytical tool for stable isotope ratios in trace gases, is a laboratory-based technique which limits temporal and spatial resolution capabilities. Alternatively, a isotopic species because of their characteristic rotational-vibrational transitions. 4bsorption spectroscopy in the mid-infrared is a direct method to distinguish between all relevant CHD, and the respective isotope ratios 3 and CH4CH13, 4CH12Within this project we will thus develop an instrument to continuously monitor d13 and 4C-CHd4D-CH, using state of the art quantum cascade laser absorption spectrometry (QCLAS). The instrument will be based on recently developed 7.5 mym, continuous wave room temperature lasers (cw-RT-QCL) and a novel astigmatic multipath cell with an optical path length of 200 m. To obtain the necessary precision of 0.1Prozent (d13) and 14C-CHProzent (d4D-CH), the QCLAS will be coupled to an automated, liquid-nitrogen free preconcentration unit.
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Messgerät ? Absorptionsspektralanalyse ? Laser ? Laserspektroskopie ? Lösungsmittel ? Spurengas ? Methan ? Probenaufbereitung ? Spektralanalyse ? Gasförmiger Stoff ? Globale Erwärmung ? Isotop ? Messverfahren ? Umwelttechnik ? Luftschadstoff ? Forschungseinrichtung ? Treibhausgas ? Auflösungsvermögen ? Isotopenverhältnis ? Kontinuierliches Verfahren ? Laseranwendung ? Messgenauigkeit ? Raumtemperatur ? Schadstoffnachweis ? methane isotopes ? quantum cascade laser ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2012-01-01 - 2014-12-31
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