1 / 20

High-Resolution Spectroscopy of the ν 16 Band of 1,3,5-Trioxane

High-Resolution Spectroscopy of the ν 16 Band of 1,3,5-Trioxane. Bradley M. Gibson and Nicole Koeppen Department of Chemistry, University of Illinois at Urbana-Champaign Benjamin J. McCall Departments of Chemistry and Astronomy, University of Illinois at Urbana-Champaign. Motivations

magnar
Download Presentation

High-Resolution Spectroscopy of the ν 16 Band of 1,3,5-Trioxane

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. High-Resolution Spectroscopy of the ν16 Band of 1,3,5-Trioxane Bradley M. Gibson and Nicole Koeppen Department of Chemistry, University of Illinois at Urbana-Champaign Benjamin J. McCall Departments of Chemistry and Astronomy, University of Illinois at Urbana-Champaign

  2. Motivations • Previous Work • Spectrometer Design • CRDS Overview • Optical Layout • Observed Spectra • Future Work Outline

  3. C3vsymmetry, chair conformation • Only one rotationally-resolved band observed • 220 km/mol band at 1178 cm-1 • Strong band would be useful for characterizing newlydeveloped equipment Why study trioxane? Figure from: M. Kobayashi et al., “Vibrational Spectra of Trioxane and Trioxane-d6” J. Chem. Phys. 44, 922 (1966)

  4. Numerous low-res vibrational spectra, including Kobayashi et al. in 1965 • Microwave spectrum observed by Oka et al. in 1963 • Only one rotationally-resolved spectrum, ν17 by Henninotet al.in 1992 Previous Studies Figure from: J-F. Henninotet al., “The Infrared Spectrum of Trioxane in a Supersonic Slit Jet”. J. Mol. Spect.152, 62 (1992)

  5. How does CRDS work? Laser AOM Power Piezo Time

  6. How does CRDS work? Laser AOM Power Piezo Time

  7. How does CRDS work? Laser AOM Cavity on-resonance Power Piezo Time

  8. How does CRDS work? Laser AOM AOM switched off Power Piezo Time

  9. How does CRDS work? Laser AOM • Cavity enhanced sensitivity • No noise from laser powerfluctuation Power Piezo Time

  10. SO2 Cell Spectrometer Layout Wavemeter AOM EC-QCL Fresnel Rhomb Polarizer Cavity

  11. What do we expect to see? Figure generated using PGopher

  12. What did we see?

  13. What did we see?

  14. Are the spectra reproducible? Peak positions vary by approximately ±150 MHz

  15. What’s causing the uncertainty?

  16. What resolution do we need? Simulation convolved with 150 MHz gaussian Figure generated using PGopher

  17. What resolution do we need? Simulated with 30 MHz resolution – resolved! Figure generated using PGopher

  18. Is our locked EC-QCL sufficient? Feature <10 MHz (approx) resolved!

  19. Finish stabilizing EC-QCL • Re-acquire spectrum with better stability • Fit spectrum • New experiments: • Cyanuric Acid • Supercritical Fluid Source What’s next? Wikimedia Commons Figures from:B.M. Gibson et al., “Development of a Sheath-Flow Supercritical Fluid Source for Vaporization of Nonvolatiles at Moderate Temperatures”. 68th ISMS, 2013

  20. Acknowledgements

More Related