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Johannes A Lercher - One of the best experts on this subject based on the ideXlab platform.
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synthesis of Methyl Mercaptan from carbonyl sulfide over sulfide k2moo4 sio2
Journal of Catalysis, 2011Co-Authors: Oliver Y Gutierrez, Christoph Kaufmann, Ana Hrabar, Yongzhong Zhu, Johannes A LercherAbstract:The synthesis of Methyl Mercaptan from COS and H2 on K+ promoted MoS2 supported on silica is explored. The reaction proceeds via the disproportionation of COS to CO2 and CS2 and the consecutive hydrogenation of CS2 to CH3SH. In parallel to the disproportionation, COS also decomposes to CO and H2S. The characterization of the catalyst by means of XRD, Raman spectroscopy, and adsorption of NO suggests that two active phases, i.e., relatively pure MoS2 and K+-decorated MoS2, are present in the sulfided catalyst. The disproportionation of COS and the hydrogenation of CS2 are favored on K+-decorated MoS2; the decomposition of COS to CO is the favored route on pure MoS2. The reaction mechanisms for the decomposition of COS and the hydrogenation of CS2 are discussed.
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Synthesis of Methyl Mercaptan from carbonyl sulfide over sulfide K2MoO4/SiO2
Journal of Catalysis, 2011Co-Authors: Oliver Y Gutierrez, Christoph Kaufmann, Ana Hrabar, Yongzhong Zhu, Johannes A LercherAbstract:Abstract The synthesis of Methyl Mercaptan from COS and H2 on K+ promoted MoS2 supported on silica is explored. The reaction proceeds via the disproportionation of COS to CO2 and CS2 and the consecutive hydrogenation of CS2 to CH3SH. In parallel to the disproportionation, COS also decomposes to CO and H2S. The characterization of the catalyst by means of XRD, Raman spectroscopy, and adsorption of NO suggests that two active phases, i.e., relatively pure MoS2 and K+-decorated MoS2, are present in the sulfided catalyst. The disproportionation of COS and the hydrogenation of CS2 are favored on K+-decorated MoS2; the decomposition of COS to CO is the favored route on pure MoS2. The reaction mechanisms for the decomposition of COS and the hydrogenation of CS2 are discussed.
Frank Lewen - One of the best experts on this subject based on the ideXlab platform.
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rotational spectrum of isotopic Methyl Mercaptan 13ch3sh in the laboratory and towards sagittarius b2 n2
Canadian Journal of Physics, 2020Co-Authors: Vadim V. Ilyushin, Olena Zakharenko, Frank Lewen, Stephan Schlemmer, E A Alekseev, Mykola Pogrebnyak, R M Lees, A Belloche, K M Menten, Robin T GarrodAbstract:Methyl Mercaptan (CH3SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims to provide accurate ...
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Rotational spectrum of isotopic Methyl Mercaptan, 13CH3SH, in the laboratory and towards Sagittarius B2(N2)1
Canadian Journal of Physics, 2020Co-Authors: Vadim V. Ilyushin, Olena Zakharenko, Frank Lewen, Stephan Schlemmer, E A Alekseev, Mykola Pogrebnyak, A Belloche, Ronald M. Lees, K M MentenAbstract:Methyl Mercaptan (CH3SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims to provide accurate ...
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Rotational spectrum of isotopic Methyl Mercaptan, (13)CH3SH, in the laboratory and towards Sagittarius B2(N2).
arXiv: Solar and Stellar Astrophysics, 2019Co-Authors: Vadim V. Ilyushin, Olena Zakharenko, Frank Lewen, Stephan Schlemmer, E A Alekseev, Mykola Pogrebnyak, A Belloche, Ronald M. Lees, K M MentenAbstract:Methyl Mercaptan (CH3SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims at providing accurate spectroscopic parameters for the (13)CH3SH isotopologue to facilitate its identification in the interstellar medium at millimetre and submillimetre wavelengths. Through careful analysis of recent CH3SH spectra from 49-510 GHz and 1.1-1.5 THz recorded at natural isotopic composition, extensive assignments were possible not only for the ground torsional state of (13)CH3SH, but also in the first and second excited states. The torsion-rotation spectrum displays complex structure due to the large-amplitude internal rotation of the (13)CH3 group, similar to the main and other minor isotopic species of Methyl Mercaptan. The assigned transition frequencies have been fitted to within experimental error with a 52-parameter model employing the RAM36 programme. With predictions based on this fit, (13)CH3SH was searched for in spectra from the Atacama Large Millimetre/submillimetre Array (ALMA) towards the Galactic centre source Sgr B2(N2). Several transitions were expected to be observable, but all of them turned out to be severely blended with emission from other species, which prevents us from identifying (13)CH3SH in this source.
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Deuterated Methyl Mercaptan (CH$_3$SD): Laboratory rotational spectroscopy and search toward IRAS 16293-2422 B
Astronomy & Astrophysics, 2019Co-Authors: Olena Zakharenko, Frank Lewen, Vadim V. Ilyushin, Maria N. Drozdovskaya, Jes K. Jørgensen, Stephan Schlemmer, Holger S. P. MüllerAbstract:Methyl Mercaptan (also known as methanethiol), CH3SH, has been found in the warm and dense parts of high -- as well as low -- mass star-forming regions. The aim of the present study is to obtain accurate spectroscopic parameters of the S-deuterated Methyl Mercaptan CH$_3$SD to facilitate astronomical observations by radio telescope arrays at (sub)millimeter wavelengths. We have measured the rotational spectrum associated with the large-amplitude internal rotation of the Methyl group of Methyl Mercaptan using an isotopically enriched sample in the 150-510 GHz frequency range using the K\"oln millimeter wave spectrometer. The analysis of the spectra has been performed up to the second excited torsional state. We present modeling results of these data with the RAM36 program. CH$_3$SD was searched for, but not detected, in data from the Atacama Large Millimeter/submillimeter Array (ALMA) Protostellar Interferometric Line Survey (PILS) of the deeply embedded protostar IRAS 16293-2422. The derived upper limit corresponds to a degree of deuteration of at most ~18%.
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deuterated Methyl Mercaptan ch 3 sd laboratory rotational spectroscopy and search toward iras 16293 2422 b
Astronomy and Astrophysics, 2019Co-Authors: Olena Zakharenko, Frank Lewen, Vadim V. Ilyushin, Maria N. Drozdovskaya, Jes K. Jørgensen, Stephan Schlemmer, Holger S. P. MüllerAbstract:Methyl Mercaptan (also known as methanethiol), CH₃SH, has been found in the warm and dense parts of high- as well as low- mass star-forming regions. The aim of the present study is to obtain accurate spectroscopic parameters of the S-deuterated Methyl Mercaptan CH₃SD to facilitate astronomical observations by radio telescope arrays at (sub)millimeter wavelengths. We have measured the rotational spectrum associated with the large-amplitude internal rotation of the Methyl group of Methyl Mercaptan using an isotopically enriched sample in the 150−510 GHz frequency range using the Koln millimeter wave spectrometer. The analysis of the spectra has been performed up to the second excited torsional state. We present modeling results of these data with the RAM36 program. CH₃SD was searched for, but not detected, in data from the Atacama Large Millimeter/submillimeter Array (ALMA) Protostellar Interferometric Line Survey (PILS) of the deeply embedded protostar IRAS 16293−2422. The derived upper limit corresponds to a degree of deuteration of at most ∼18%.
Stephan Schlemmer - One of the best experts on this subject based on the ideXlab platform.
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rotational spectrum of isotopic Methyl Mercaptan 13ch3sh in the laboratory and towards sagittarius b2 n2
Canadian Journal of Physics, 2020Co-Authors: Vadim V. Ilyushin, Olena Zakharenko, Frank Lewen, Stephan Schlemmer, E A Alekseev, Mykola Pogrebnyak, R M Lees, A Belloche, K M Menten, Robin T GarrodAbstract:Methyl Mercaptan (CH3SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims to provide accurate ...
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Rotational spectrum of isotopic Methyl Mercaptan, 13CH3SH, in the laboratory and towards Sagittarius B2(N2)1
Canadian Journal of Physics, 2020Co-Authors: Vadim V. Ilyushin, Olena Zakharenko, Frank Lewen, Stephan Schlemmer, E A Alekseev, Mykola Pogrebnyak, A Belloche, Ronald M. Lees, K M MentenAbstract:Methyl Mercaptan (CH3SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims to provide accurate ...
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Rotational spectrum of isotopic Methyl Mercaptan, (13)CH3SH, in the laboratory and towards Sagittarius B2(N2).
arXiv: Solar and Stellar Astrophysics, 2019Co-Authors: Vadim V. Ilyushin, Olena Zakharenko, Frank Lewen, Stephan Schlemmer, E A Alekseev, Mykola Pogrebnyak, A Belloche, Ronald M. Lees, K M MentenAbstract:Methyl Mercaptan (CH3SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims at providing accurate spectroscopic parameters for the (13)CH3SH isotopologue to facilitate its identification in the interstellar medium at millimetre and submillimetre wavelengths. Through careful analysis of recent CH3SH spectra from 49-510 GHz and 1.1-1.5 THz recorded at natural isotopic composition, extensive assignments were possible not only for the ground torsional state of (13)CH3SH, but also in the first and second excited states. The torsion-rotation spectrum displays complex structure due to the large-amplitude internal rotation of the (13)CH3 group, similar to the main and other minor isotopic species of Methyl Mercaptan. The assigned transition frequencies have been fitted to within experimental error with a 52-parameter model employing the RAM36 programme. With predictions based on this fit, (13)CH3SH was searched for in spectra from the Atacama Large Millimetre/submillimetre Array (ALMA) towards the Galactic centre source Sgr B2(N2). Several transitions were expected to be observable, but all of them turned out to be severely blended with emission from other species, which prevents us from identifying (13)CH3SH in this source.
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Deuterated Methyl Mercaptan (CH$_3$SD): Laboratory rotational spectroscopy and search toward IRAS 16293-2422 B
Astronomy & Astrophysics, 2019Co-Authors: Olena Zakharenko, Frank Lewen, Vadim V. Ilyushin, Maria N. Drozdovskaya, Jes K. Jørgensen, Stephan Schlemmer, Holger S. P. MüllerAbstract:Methyl Mercaptan (also known as methanethiol), CH3SH, has been found in the warm and dense parts of high -- as well as low -- mass star-forming regions. The aim of the present study is to obtain accurate spectroscopic parameters of the S-deuterated Methyl Mercaptan CH$_3$SD to facilitate astronomical observations by radio telescope arrays at (sub)millimeter wavelengths. We have measured the rotational spectrum associated with the large-amplitude internal rotation of the Methyl group of Methyl Mercaptan using an isotopically enriched sample in the 150-510 GHz frequency range using the K\"oln millimeter wave spectrometer. The analysis of the spectra has been performed up to the second excited torsional state. We present modeling results of these data with the RAM36 program. CH$_3$SD was searched for, but not detected, in data from the Atacama Large Millimeter/submillimeter Array (ALMA) Protostellar Interferometric Line Survey (PILS) of the deeply embedded protostar IRAS 16293-2422. The derived upper limit corresponds to a degree of deuteration of at most ~18%.
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deuterated Methyl Mercaptan ch 3 sd laboratory rotational spectroscopy and search toward iras 16293 2422 b
Astronomy and Astrophysics, 2019Co-Authors: Olena Zakharenko, Frank Lewen, Vadim V. Ilyushin, Maria N. Drozdovskaya, Jes K. Jørgensen, Stephan Schlemmer, Holger S. P. MüllerAbstract:Methyl Mercaptan (also known as methanethiol), CH₃SH, has been found in the warm and dense parts of high- as well as low- mass star-forming regions. The aim of the present study is to obtain accurate spectroscopic parameters of the S-deuterated Methyl Mercaptan CH₃SD to facilitate astronomical observations by radio telescope arrays at (sub)millimeter wavelengths. We have measured the rotational spectrum associated with the large-amplitude internal rotation of the Methyl group of Methyl Mercaptan using an isotopically enriched sample in the 150−510 GHz frequency range using the Koln millimeter wave spectrometer. The analysis of the spectra has been performed up to the second excited torsional state. We present modeling results of these data with the RAM36 program. CH₃SD was searched for, but not detected, in data from the Atacama Large Millimeter/submillimeter Array (ALMA) Protostellar Interferometric Line Survey (PILS) of the deeply embedded protostar IRAS 16293−2422. The derived upper limit corresponds to a degree of deuteration of at most ∼18%.
Olena Zakharenko - One of the best experts on this subject based on the ideXlab platform.
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rotational spectrum of isotopic Methyl Mercaptan 13ch3sh in the laboratory and towards sagittarius b2 n2
Canadian Journal of Physics, 2020Co-Authors: Vadim V. Ilyushin, Olena Zakharenko, Frank Lewen, Stephan Schlemmer, E A Alekseev, Mykola Pogrebnyak, R M Lees, A Belloche, K M Menten, Robin T GarrodAbstract:Methyl Mercaptan (CH3SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims to provide accurate ...
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Rotational spectrum of isotopic Methyl Mercaptan, 13CH3SH, in the laboratory and towards Sagittarius B2(N2)1
Canadian Journal of Physics, 2020Co-Authors: Vadim V. Ilyushin, Olena Zakharenko, Frank Lewen, Stephan Schlemmer, E A Alekseev, Mykola Pogrebnyak, A Belloche, Ronald M. Lees, K M MentenAbstract:Methyl Mercaptan (CH3SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims to provide accurate ...
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Rotational spectrum of isotopic Methyl Mercaptan, (13)CH3SH, in the laboratory and towards Sagittarius B2(N2).
arXiv: Solar and Stellar Astrophysics, 2019Co-Authors: Vadim V. Ilyushin, Olena Zakharenko, Frank Lewen, Stephan Schlemmer, E A Alekseev, Mykola Pogrebnyak, A Belloche, Ronald M. Lees, K M MentenAbstract:Methyl Mercaptan (CH3SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims at providing accurate spectroscopic parameters for the (13)CH3SH isotopologue to facilitate its identification in the interstellar medium at millimetre and submillimetre wavelengths. Through careful analysis of recent CH3SH spectra from 49-510 GHz and 1.1-1.5 THz recorded at natural isotopic composition, extensive assignments were possible not only for the ground torsional state of (13)CH3SH, but also in the first and second excited states. The torsion-rotation spectrum displays complex structure due to the large-amplitude internal rotation of the (13)CH3 group, similar to the main and other minor isotopic species of Methyl Mercaptan. The assigned transition frequencies have been fitted to within experimental error with a 52-parameter model employing the RAM36 programme. With predictions based on this fit, (13)CH3SH was searched for in spectra from the Atacama Large Millimetre/submillimetre Array (ALMA) towards the Galactic centre source Sgr B2(N2). Several transitions were expected to be observable, but all of them turned out to be severely blended with emission from other species, which prevents us from identifying (13)CH3SH in this source.
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Deuterated Methyl Mercaptan (CH$_3$SD): Laboratory rotational spectroscopy and search toward IRAS 16293-2422 B
Astronomy & Astrophysics, 2019Co-Authors: Olena Zakharenko, Frank Lewen, Vadim V. Ilyushin, Maria N. Drozdovskaya, Jes K. Jørgensen, Stephan Schlemmer, Holger S. P. MüllerAbstract:Methyl Mercaptan (also known as methanethiol), CH3SH, has been found in the warm and dense parts of high -- as well as low -- mass star-forming regions. The aim of the present study is to obtain accurate spectroscopic parameters of the S-deuterated Methyl Mercaptan CH$_3$SD to facilitate astronomical observations by radio telescope arrays at (sub)millimeter wavelengths. We have measured the rotational spectrum associated with the large-amplitude internal rotation of the Methyl group of Methyl Mercaptan using an isotopically enriched sample in the 150-510 GHz frequency range using the K\"oln millimeter wave spectrometer. The analysis of the spectra has been performed up to the second excited torsional state. We present modeling results of these data with the RAM36 program. CH$_3$SD was searched for, but not detected, in data from the Atacama Large Millimeter/submillimeter Array (ALMA) Protostellar Interferometric Line Survey (PILS) of the deeply embedded protostar IRAS 16293-2422. The derived upper limit corresponds to a degree of deuteration of at most ~18%.
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deuterated Methyl Mercaptan ch 3 sd laboratory rotational spectroscopy and search toward iras 16293 2422 b
Astronomy and Astrophysics, 2019Co-Authors: Olena Zakharenko, Frank Lewen, Vadim V. Ilyushin, Maria N. Drozdovskaya, Jes K. Jørgensen, Stephan Schlemmer, Holger S. P. MüllerAbstract:Methyl Mercaptan (also known as methanethiol), CH₃SH, has been found in the warm and dense parts of high- as well as low- mass star-forming regions. The aim of the present study is to obtain accurate spectroscopic parameters of the S-deuterated Methyl Mercaptan CH₃SD to facilitate astronomical observations by radio telescope arrays at (sub)millimeter wavelengths. We have measured the rotational spectrum associated with the large-amplitude internal rotation of the Methyl group of Methyl Mercaptan using an isotopically enriched sample in the 150−510 GHz frequency range using the Koln millimeter wave spectrometer. The analysis of the spectra has been performed up to the second excited torsional state. We present modeling results of these data with the RAM36 program. CH₃SD was searched for, but not detected, in data from the Atacama Large Millimeter/submillimeter Array (ALMA) Protostellar Interferometric Line Survey (PILS) of the deeply embedded protostar IRAS 16293−2422. The derived upper limit corresponds to a degree of deuteration of at most ∼18%.
Oliver Y Gutierrez - One of the best experts on this subject based on the ideXlab platform.
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synthesis of Methyl Mercaptan from carbonyl sulfide over sulfide k2moo4 sio2
Journal of Catalysis, 2011Co-Authors: Oliver Y Gutierrez, Christoph Kaufmann, Ana Hrabar, Yongzhong Zhu, Johannes A LercherAbstract:The synthesis of Methyl Mercaptan from COS and H2 on K+ promoted MoS2 supported on silica is explored. The reaction proceeds via the disproportionation of COS to CO2 and CS2 and the consecutive hydrogenation of CS2 to CH3SH. In parallel to the disproportionation, COS also decomposes to CO and H2S. The characterization of the catalyst by means of XRD, Raman spectroscopy, and adsorption of NO suggests that two active phases, i.e., relatively pure MoS2 and K+-decorated MoS2, are present in the sulfided catalyst. The disproportionation of COS and the hydrogenation of CS2 are favored on K+-decorated MoS2; the decomposition of COS to CO is the favored route on pure MoS2. The reaction mechanisms for the decomposition of COS and the hydrogenation of CS2 are discussed.
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Synthesis of Methyl Mercaptan from carbonyl sulfide over sulfide K2MoO4/SiO2
Journal of Catalysis, 2011Co-Authors: Oliver Y Gutierrez, Christoph Kaufmann, Ana Hrabar, Yongzhong Zhu, Johannes A LercherAbstract:Abstract The synthesis of Methyl Mercaptan from COS and H2 on K+ promoted MoS2 supported on silica is explored. The reaction proceeds via the disproportionation of COS to CO2 and CS2 and the consecutive hydrogenation of CS2 to CH3SH. In parallel to the disproportionation, COS also decomposes to CO and H2S. The characterization of the catalyst by means of XRD, Raman spectroscopy, and adsorption of NO suggests that two active phases, i.e., relatively pure MoS2 and K+-decorated MoS2, are present in the sulfided catalyst. The disproportionation of COS and the hydrogenation of CS2 are favored on K+-decorated MoS2; the decomposition of COS to CO is the favored route on pure MoS2. The reaction mechanisms for the decomposition of COS and the hydrogenation of CS2 are discussed.