Temperature-dependent absorption cross-section measurements of 1-butene (1-C4H8) in VUV and IR

Et-touhami Es-sebbar, Yves Bénilan, Aamir Farooq

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Vacuum ultraviolet (VUV) and infrared (IR) absorption cross-section measurements of 1-butene (1-C4H8; CH2=CHCH2CH3; Butylene) are reported over the temperature range of 296-529K. The VUV measurements are performed between 115 and 205nm using synchrotron radiation as a tunable VUV light source. Fourier Transform Infrared (FTIR) spectroscopy is employed to measure absorption cross-section and band strengths in the IR region between 1.54 and 25μm (~6500-400cm-1). The measured room-temperature VUV and IR absorption cross-sections are compared with available literature data and are found to be in good agreement. The oscillator strength for the electronic transition (A1A'→X1A') around 150-205nm is determined to be 0.32±0.01.The gas temperature has a strong effect on both VUV and IR spectra. Measurements made in the VUV region show that the peak value of the band cross-section decreases and the background continuum increases with increasing gas temperature. This behavior is due to a change in the rotational and vibrational population distribution of 1-butene molecule. Similar changes in rotational population are observed in the IR spectra. Moreover, variation of the IR spectra with temperature is used to measure the enthalpy difference between syn and skew conformations of 1-butene and is found to be 0.24±0.03. kcal/mol, which is in excellent agreement with values reported in the literature. The measurements reported in this work will provide the much-needed spectroscopic information for the development of high-temperature quantitative diagnostics in combustion applications and validation of atmospheric chemistry models of extra-solar planets. © 2012 Elsevier Ltd.
Original languageEnglish (US)
Pages (from-to)1-12
Number of pages12
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume115
DOIs
StatePublished - Jan 2013

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors wish to thank Gerd Reichard for his assistance during the synchrotron radiation experiments and Hans-Werner Jochims for judicious advice concerning the VUV spectroscopy. We acknowledge the financial support of the European Commission program "Access to Research Infrastructures" for providing access to the synchrotron facility BESSY in Berlin, Germany. We also acknowledge the financial support of the French program PNP (INSUCNRS) and the travel support provided by University Paris-Est Creteil (UPEC).

ASJC Scopus subject areas

  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Radiation

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