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Cavity Ring Down at Low Temperatures: Application to Atmospheric Chemistry Carlos E. Manzanares Department of Chemistry & Biochemistry Baylor University.

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Presentation on theme: "Cavity Ring Down at Low Temperatures: Application to Atmospheric Chemistry Carlos E. Manzanares Department of Chemistry & Biochemistry Baylor University."— Presentation transcript:

1 Cavity Ring Down at Low Temperatures: Application to Atmospheric Chemistry Carlos E. Manzanares Department of Chemistry & Biochemistry Baylor University Waco, Texas 76798

2 Acknowledgements Baylor University Dr. Ernest K. LewisDr. Craig J. Moehnke Dr. Alfredo Lopez-CalvoDr. Juan G. Navea Helena Diez y RiegaYasnahir Perez Delgado Nicholas HernandezJenny Barroso David Camejo Universidad Simon Bolivar, Caracas, Venezuela: Dr. Mary C. Salazar, Dr. Antonio J. Hernandez The Robert A. Welch Foundation The Quantum Optics Initiative funded by the O.N.R., Texas A&M, and the Vice Provost for Research at Baylor University

3 Atmospheric Chemistry

4 Earth: Temperature Profile

5 Atmospheric Photolysis Rates

6 Calculated (J) for H 2 SO 4 Photolysis H 2 SO 4 + h ν -> SO 3 + H 2 O Vaida et al., Science, (2003), 299, 1566-1568

7 How to obtain σ  Experimental: Multipass ‘White’ Cell Experimental: Cavity Ring Down Theoretical: Calculations of Overtone Intensities

8 PS-CRD Signal

9 Experimental Technique

10 Low Temperature Cryostat

11 Methane

12 Ethylene

13 Integrated Cross Section

14 Atmospheric Photolysis Rates

15 Ethyl acetate

16 Ethyl acetate: activation energy

17 + Ethyl acetate: transition state h

18 Titan

19 Titan’s Atmosphere

20 Summary A Cavity ring down spectrometer has been constructed to obtain high vibrational overtone spectra of molecules. Experiments at low pressures and low temperatures (100-250 K) provide σ( ) values simulating atmospheric conditions. Low temperature (100-250 K) quantum yields of chemical reactions are being obtained for vibrationally excited molecules under atmospheric conditions.

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