High-Resolution Spectroscopy of the ν16 Band of 1,3,5-Trioxane

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Presentation transcript:

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

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

Why study trioxane? C3v symmetry, chair conformation Only one rotationally-resolved band observed 220 km/mol band at 1178 cm-1 Strong band would be useful for characterizing newly developed equipment Figure from: M. Kobayashi et al., “Vibrational Spectra of Trioxane and Trioxane-d6” J. Chem. Phys. 44, 922 (1966)

Previous Studies 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 Henninot et al. in 1992 Figure from: J-F. Henninot et al., “The Infrared Spectrum of Trioxane in a Supersonic Slit Jet”. J. Mol. Spect. 152, 62 (1992)

How does CRDS work? Piezo Laser AOM Power Time

How does CRDS work? Piezo Laser AOM Power Time

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

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

How does CRDS work? Cavity enhanced sensitivity Piezo Laser AOM Power Time Cavity enhanced sensitivity No noise from laser power fluctuation

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

What do we expect to see? Figure generated using PGopher

What did we see?

What did we see?

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

What’s causing the uncertainty?

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

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

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

What’s next? Finish stabilizing EC-QCL Re-acquire spectrum with better stability Fit spectrum New experiments: Cyanuric Acid Supercritical Fluid Source 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

Acknowledgements