The chemistry, and radiative and collisional interactions of H3 in the early Universe are examined. The object of study is to investigate whether H3 is essential in cooling of the primordial gas and thus in the formation of the first stars. The consensus so far is overwhelmingly negative. Most previous papers ignore the possibility at the onset because of the very low concentration of H3 , about 10 −9 of H2 or less. Since the dipole infrared emission of H3 is (λ/a) 2 ∼ 10 (λ wavelength: a molecular size) times faster than the quadrupole emission of H2, however, there is a possibility that H3 is comparably efficient coolant as H2. Glover and Savina was the only paper which took this possibility into account. They negate the contribution of H3 because at a gas density higher than 10 cm−3 H3 number density is further reduced by endothermic reaction H + 3 + H → H2 + H + 2 . We will examine this. We will consider the following two effects which have been neglected by the previous workers: (1) the effect of collision which convert translational energy of the gas into the energy of vibration and rotation of the molecules and (2) the effect of spontaneous emission between rotational levels. We find H3 can be a more efficient coolant than H2 in the early Universe depending on temperature, density, and cosmological conditions of the primordial gas at the time of star formation.
{"title":"H3+ IN THE EARLY UNIVERSE","authors":"Yu-Shan Chen, T. Oka","doi":"10.15278/ISMS.2019.FA03","DOIUrl":"https://doi.org/10.15278/ISMS.2019.FA03","url":null,"abstract":"The chemistry, and radiative and collisional interactions of H3 in the early Universe are examined. The object of study is to investigate whether H3 is essential in cooling of the primordial gas and thus in the formation of the first stars. The consensus so far is overwhelmingly negative. Most previous papers ignore the possibility at the onset because of the very low concentration of H3 , about 10 −9 of H2 or less. Since the dipole infrared emission of H3 is (λ/a) 2 ∼ 10 (λ wavelength: a molecular size) times faster than the quadrupole emission of H2, however, there is a possibility that H3 is comparably efficient coolant as H2. Glover and Savina was the only paper which took this possibility into account. They negate the contribution of H3 because at a gas density higher than 10 cm−3 H3 number density is further reduced by endothermic reaction H + 3 + H → H2 + H + 2 . We will examine this. We will consider the following two effects which have been neglected by the previous workers: (1) the effect of collision which convert translational energy of the gas into the energy of vibration and rotation of the molecules and (2) the effect of spontaneous emission between rotational levels. We find H3 can be a more efficient coolant than H2 in the early Universe depending on temperature, density, and cosmological conditions of the primordial gas at the time of star formation.","PeriodicalId":20752,"journal":{"name":"Proceedings of the 74th International Symposium on Molecular Spectroscopy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84760964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"DEVELOPMENT AND PERFORMANCE OF LILLE'S FOURIER TRANSFORM MILLIMETER-WAVE SPECTROMETER","authors":"L. Zou, R. Motiyenko, L. Margulès, E. Alekseev","doi":"10.15278/ISMS.2019.FB04","DOIUrl":"https://doi.org/10.15278/ISMS.2019.FB04","url":null,"abstract":"","PeriodicalId":20752,"journal":{"name":"Proceedings of the 74th International Symposium on Molecular Spectroscopy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88781296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wavenumber / cm -1 28 SiF4 Q branch Volcanoes reject large amounts of sulfurcontaining gases in the atmosphere; these represent 10 to 15 % of the anthropogenic sulfur emissions. Thermodynamic considerations show that silicon tetrafluoride (SiF4) should be a normal trace component of volcanic gases. Some studies report that the possible importance of SiF4 had been neglected because of the problems of reporting HF and SiF4 separately in conventional analyses. However, a better knowledge of spectroscopic parameters is needed for this molecule in order to derive accurate concentrations. This is why we undertook an extensive high-resolution study of its infrared absorption bands, including the fundamentals and several overtone and combinations. We present here a detailed analysis and modeling of the strongly absorbing ν3 fundamental, for the three isotopologues in natural abundance: 28SiF4 (92.23 %), 29SiF4 (4.67 %) and 30SiF4 (3.10 %). Progresses in the analysis of the other bands will be outlined.
{"title":"HIGH-RESOLUTION INFRARED SPECTRA AND ANALYSES OF SiF4","authors":"V. Boudon, L. Manceron","doi":"10.15278/ISMS.2019.FB08","DOIUrl":"https://doi.org/10.15278/ISMS.2019.FB08","url":null,"abstract":"Wavenumber / cm -1 28 SiF4 Q branch Volcanoes reject large amounts of sulfurcontaining gases in the atmosphere; these represent 10 to 15 % of the anthropogenic sulfur emissions. Thermodynamic considerations show that silicon tetrafluoride (SiF4) should be a normal trace component of volcanic gases. Some studies report that the possible importance of SiF4 had been neglected because of the problems of reporting HF and SiF4 separately in conventional analyses. However, a better knowledge of spectroscopic parameters is needed for this molecule in order to derive accurate concentrations. This is why we undertook an extensive high-resolution study of its infrared absorption bands, including the fundamentals and several overtone and combinations. We present here a detailed analysis and modeling of the strongly absorbing ν3 fundamental, for the three isotopologues in natural abundance: 28SiF4 (92.23 %), 29SiF4 (4.67 %) and 30SiF4 (3.10 %). Progresses in the analysis of the other bands will be outlined.","PeriodicalId":20752,"journal":{"name":"Proceedings of the 74th International Symposium on Molecular Spectroscopy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89192008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"MODELING ELECTRON DETACHMENT FROM METAL OXIDE CLUSTERS WITH EFFICIENT ELECTRONIC STRUCTURE METHODS","authors":"H. Hratchian","doi":"10.15278/ISMS.2019.FF03","DOIUrl":"https://doi.org/10.15278/ISMS.2019.FF03","url":null,"abstract":"","PeriodicalId":20752,"journal":{"name":"Proceedings of the 74th International Symposium on Molecular Spectroscopy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76509320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"LASER-INDUCED FLUORESCENCE STUDY OF JET-COOLED TUNGSTEN MONOXIDE (WO) IN GAS PHASE","authors":"Jie Yang, Jicai Zhang, Xinwen Ma","doi":"10.15278/ISMS.2019.FD03","DOIUrl":"https://doi.org/10.15278/ISMS.2019.FD03","url":null,"abstract":"","PeriodicalId":20752,"journal":{"name":"Proceedings of the 74th International Symposium on Molecular Spectroscopy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74422696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"H3+, THE IDEAL PROBE FOR IN SITU MEASUREMENT OF GALACTIC COSMIC RAYS","authors":"T. Oka","doi":"10.15278/ISMS.2019.FA02","DOIUrl":"https://doi.org/10.15278/ISMS.2019.FA02","url":null,"abstract":"","PeriodicalId":20752,"journal":{"name":"Proceedings of the 74th International Symposium on Molecular Spectroscopy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78347199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jarrett L. Mason, C. Jarrold, S. Iyengar, Joshua C Ewigleben, Josey E. Topolski
{"title":"MOMENTUM DICTATES INTENSITY: UNUSUAL OBSERVATIONS IN PHOTOELECTRON SPECTROSCOPY","authors":"Jarrett L. Mason, C. Jarrold, S. Iyengar, Joshua C Ewigleben, Josey E. Topolski","doi":"10.15278/ISMS.2019.FF02","DOIUrl":"https://doi.org/10.15278/ISMS.2019.FF02","url":null,"abstract":"","PeriodicalId":20752,"journal":{"name":"Proceedings of the 74th International Symposium on Molecular Spectroscopy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84702700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jessica P. Porterfield, Kelvin Lee, V. Dell'Isola, Brandon Carroll, M. McCarthy
{"title":"CHARACTERIZATION OF HYDROPEROXYMETHYL FORMATE BY MICROWAVE SPECTROSCOPY: MOLECULAR INSIGHT INTO AEROSOL FORMATION","authors":"Jessica P. Porterfield, Kelvin Lee, V. Dell'Isola, Brandon Carroll, M. McCarthy","doi":"10.15278/ISMS.2019.FB01","DOIUrl":"https://doi.org/10.15278/ISMS.2019.FB01","url":null,"abstract":"","PeriodicalId":20752,"journal":{"name":"Proceedings of the 74th International Symposium on Molecular Spectroscopy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84198845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Meredith L Ward, Jonathan Flores, Sederra D. Ross, Laura M. McCaslin, J. Stanton, N. Reilly
{"title":"IDENTIFYING AN UNKNOWN ISOMER OF C7H7 OBSERVED IN JET-COOLED HYDROCARBON DISCHARGES","authors":"Meredith L Ward, Jonathan Flores, Sederra D. Ross, Laura M. McCaslin, J. Stanton, N. Reilly","doi":"10.15278/ISMS.2019.FD06","DOIUrl":"https://doi.org/10.15278/ISMS.2019.FD06","url":null,"abstract":"","PeriodicalId":20752,"journal":{"name":"Proceedings of the 74th International Symposium on Molecular Spectroscopy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80665597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ahmad Y. Adam, A. Yachmenev, S. Yurchenko, P. Jensen
{"title":"A VARIATIONALLY COMPUTED T=300�K LINE LIST FOR THE METHYL RADICAL CH3","authors":"Ahmad Y. Adam, A. Yachmenev, S. Yurchenko, P. Jensen","doi":"10.15278/ISMS.2019.FA07","DOIUrl":"https://doi.org/10.15278/ISMS.2019.FA07","url":null,"abstract":"","PeriodicalId":20752,"journal":{"name":"Proceedings of the 74th International Symposium on Molecular Spectroscopy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79406990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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