Molecular Spectroscopy At The University Of Toronto
And Future Applications To Mars
M. O. Ishtiak, O. Colebatch, And K. Strong Department Of Physics, University Of Toronto, Toronto, On,
Canada (Osama.Ishtiak@Mail.Utoronto.Ca)
Introduction:
Molecular Spectroscopy Measurements In Our Lab
At The Department Of Physics Are Being Resumed With
The Restoration Of A Small Cell And The Commissioning
Of A Multi-Pass White Cell. Both Gas Cells Are Coupled
To A Fourier-Transform Infrared Spectrometer To Acquire Spectral Data. The Small Cell Is Being Used To
Retrieve Absorption-Cross Sections, Whereas The Multipass Cell, Once Commissioned, Will Allow The Measurement Of Weakly Absorbing Gases. In Particular, The
Multi-Pass Cell Will Enable The Measurement Of Co2broadened Spectroscopic Line Parameters. These
Co2-Broadened Parameters Have Applications To Martian Trace Gas Retrievals Because The Martian Atmosphere Primarily Consists Of Co2. This Presentation
Will Provide An Overview Of The Laboratory Spectroscopy Facility, Absorption Cross Sections Obtained With
The Small Cell, And Plans For Future Measurements.
The Small Cell And The Multi-Pass Cell:
The Small Cell System Consists Of A High Resolution (0.004 Cm-1) Abb Bomem Da8 Fouriertransform Spectrometer And A 10 Cm Sample Cell Inside A Vacuum Jacket, Shown In Figures 1 And 2. The
Reassembled Small Cell Has Been Heat-Cleaned To Reduce Outgassing And Enable Accurate Pressure Measurements Needed To Retrieve Absorption Crosssections. Spectra Of Two Halogenated Compounds
Were Recorded And Analyzed To Test The Spectroscopic
Accuracy Of The System. In Both Cases, Spectral Measurements And Derived Absorption Cross-Sections