Precise Measurements of 12CH2D2 by Tunable Infrared Laser Direct Absorption Spectroscopy
We present precise measurements of doubly deuterated methane (12CH2D2) in natural methane samples using tunable infrared laser direct absorption spectroscopy (TILDAS). Using a 413 m optical path length astigmatic Herriott cell and two quantum cascade lasers (QCLs) scanning the spectral regions of 10...
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| Veröffentlicht in: | Analytical chemistry (Washington) 2019-12, Vol.91 (23), p.14967-14974 |
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| container_title | Analytical chemistry (Washington) |
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| creator | Gonzalez, Yenny Nelson, David D Shorter, Joanne H McManus, J. Barry Dyroff, Christoph Formolo, Michael Wang, David T Western, Colin M Ono, Shuhei |
| description | We present precise measurements of doubly deuterated methane (12CH2D2) in natural methane samples using tunable infrared laser direct absorption spectroscopy (TILDAS). Using a 413 m optical path length astigmatic Herriott cell and two quantum cascade lasers (QCLs) scanning the spectral regions of 1090.46 ± 0.1 and 1200.23 ± 0.1 cm–1, the instrument simultaneously measures the five main isotopologues of methane. The ratios 13CH3D/12CH4 and 12CH2D2/12CH4 are measured at 0.01‰ and 0.5‰ (1σ) instrumental precision, respectively. The instrumental accuracy was assessed by measuring a series of methane gases with a range of δ13C and δD values but with the abundances of all isotopologues driven to thermal equilibrium at 250 °C. The estimated accuracy of Δ12CH2D2 is 1‰ (1σ) on the basis of the results of the heated methane samples. This new TILDAS instrument provides a simple and rapid technique to explore the sources of methane in the environment. |
| doi_str_mv | 10.1021/acs.analchem.9b03412 |
| format | Article |
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Barry ; Dyroff, Christoph ; Formolo, Michael ; Wang, David T ; Western, Colin M ; Ono, Shuhei</creator><creatorcontrib>Gonzalez, Yenny ; Nelson, David D ; Shorter, Joanne H ; McManus, J. Barry ; Dyroff, Christoph ; Formolo, Michael ; Wang, David T ; Western, Colin M ; Ono, Shuhei</creatorcontrib><description>We present precise measurements of doubly deuterated methane (12CH2D2) in natural methane samples using tunable infrared laser direct absorption spectroscopy (TILDAS). Using a 413 m optical path length astigmatic Herriott cell and two quantum cascade lasers (QCLs) scanning the spectral regions of 1090.46 ± 0.1 and 1200.23 ± 0.1 cm–1, the instrument simultaneously measures the five main isotopologues of methane. The ratios 13CH3D/12CH4 and 12CH2D2/12CH4 are measured at 0.01‰ and 0.5‰ (1σ) instrumental precision, respectively. The instrumental accuracy was assessed by measuring a series of methane gases with a range of δ13C and δD values but with the abundances of all isotopologues driven to thermal equilibrium at 250 °C. The estimated accuracy of Δ12CH2D2 is 1‰ (1σ) on the basis of the results of the heated methane samples. 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The instrumental accuracy was assessed by measuring a series of methane gases with a range of δ13C and δD values but with the abundances of all isotopologues driven to thermal equilibrium at 250 °C. The estimated accuracy of Δ12CH2D2 is 1‰ (1σ) on the basis of the results of the heated methane samples. This new TILDAS instrument provides a simple and rapid technique to explore the sources of methane in the environment.</description><subject>Absorption spectroscopy</subject><subject>Chemistry</subject><subject>Deuteration</subject><subject>Gases</subject><subject>Infrared lasers</subject><subject>Infrared spectroscopy</subject><subject>Methane</subject><subject>Quantum cascade lasers</subject><subject>Spectrum analysis</subject><subject>Tunable lasers</subject><issn>0003-2700</issn><issn>1520-6882</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNpd0MFKw0AQgOFFFKzVN_Cw4MVL6swkm2yOpVVbqChYwVvYTSaYkiZxtzn07U2tIngaGL6Zwy_ENcIEgfDO5H5iGlPnH7ydpBbCCOlEjFARBLHWdCpGABAGlACciwvvNwCIgPFIvL84zivP8omN7x1vudl52ZYSabagOUm7l-u-MbZmuWxKZxwXcmU8OzmvhtOdnFrfum5XtY187YaFa33edvtLcVaa2vPVzxyLt4f79WwRrJ4fl7PpKjCEEQVlqgA0gDUpF2muS1MqTUkBSU5aJ1gqW6TahIiJhRhCZBUxoVakrMU4Ccfi9vi3c-1nz36XbSufc12bhtveZxQixCqJlRrozT-6aXs3dDsooggi-lZwVEPVP4CQHVJnh-Vv6uwndfgFfMtykA</recordid><startdate>20191203</startdate><enddate>20191203</enddate><creator>Gonzalez, Yenny</creator><creator>Nelson, David D</creator><creator>Shorter, Joanne H</creator><creator>McManus, J. 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Barry</au><au>Dyroff, Christoph</au><au>Formolo, Michael</au><au>Wang, David T</au><au>Western, Colin M</au><au>Ono, Shuhei</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Precise Measurements of 12CH2D2 by Tunable Infrared Laser Direct Absorption Spectroscopy</atitle><jtitle>Analytical chemistry (Washington)</jtitle><addtitle>Anal. Chem</addtitle><date>2019-12-03</date><risdate>2019</risdate><volume>91</volume><issue>23</issue><spage>14967</spage><epage>14974</epage><pages>14967-14974</pages><issn>0003-2700</issn><eissn>1520-6882</eissn><abstract>We present precise measurements of doubly deuterated methane (12CH2D2) in natural methane samples using tunable infrared laser direct absorption spectroscopy (TILDAS). Using a 413 m optical path length astigmatic Herriott cell and two quantum cascade lasers (QCLs) scanning the spectral regions of 1090.46 ± 0.1 and 1200.23 ± 0.1 cm–1, the instrument simultaneously measures the five main isotopologues of methane. The ratios 13CH3D/12CH4 and 12CH2D2/12CH4 are measured at 0.01‰ and 0.5‰ (1σ) instrumental precision, respectively. The instrumental accuracy was assessed by measuring a series of methane gases with a range of δ13C and δD values but with the abundances of all isotopologues driven to thermal equilibrium at 250 °C. The estimated accuracy of Δ12CH2D2 is 1‰ (1σ) on the basis of the results of the heated methane samples. 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| source | American Chemical Society Journals |
| subjects | Absorption spectroscopy Chemistry Deuteration Gases Infrared lasers Infrared spectroscopy Methane Quantum cascade lasers Spectrum analysis Tunable lasers |
| title | Precise Measurements of 12CH2D2 by Tunable Infrared Laser Direct Absorption Spectroscopy |
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