High resolution far-IR spectroscopy of HFC-134a at cold ...

High resolution far-IR spectroscopy of HFC-134a at cold ...

High resolution far-IR spectroscopy of HFC-134a at cold temperatures ANDY WONG CHRIS MEDCRAFT CHRIS THOMPSON E VA N G . R O B E R T S O N D O M I N I Q U E A P PA D O O DON MCNAUGHTON Outline PhD HFC-134a Experimental Results Conclusions Outline PhD HFC-134a

Experimental Results Conclusions 1,1,1,2-tetrafluoroethane Outline PhD HFC-134a Experimental Results Conclusions Atmospheric properties Refrigerant Greenhouse gas GWP = 1300

13 year lifetime 63 ppt (2011) 1,1,1,2-tetrafluoroethane Outline PhD HFC-134a Experimental Results Conclusions Spectroscopic properties Near prolate asymmetric top -0.969 1,1,1,2-tetrafluoroethane

Outline Spectroscopic properties Near prolate asymmetric top -0.969 Cs symmetry at equilibrium PhD HFC-134a E h Linear, rotations

Quadrati c A 1 1 x, y, Rz x2, y2, z2, xy A 1 -1 Rx, Ry, z yz, xz Experimental

Results Conclusions 18 fundamental vibrations 11 A and 7 A 8 (A) ~ 665.5 cmA) ~ 665.5 cm) ~ 665.5 cm-1 a/b-hybrid band Australian Synchrotron Decay mode Outline PhD Far-IR beamline

HFC-134a Experimental Results Conclusions z 200 mA to 150 mA External source Synchrotron source Bruker IFS125 spectrometer Maximum resolution of 0.00096 cm-1 Australian Synchrotron Decay mode Outline PhD

Far-IR beamline HFC-134a Experimental Conclusions k Synchrotron source Bruker IFS125 spectrometer Maximum resolution of 0.00096 cm -1 Enclosive flow cooling (EFC) cell

Results 200 mA to 150 mA External source White-type multipass cell Cooled with cold N2 gas to 176 K Australian Synchrotron Decay mode Outline PhD Far-IR beamline HFC-134a

Experimental Conclusions Synchrotron source Bruker IFS125 spectrometer Maximum resolution of 0.00096 cm -1 Enclosive flow cooling (EFC) cell Results 200 mA to 150 mA External source White-type multipass cell Cooled with cold N2 gas to 176 K Optics

Boron-doped silicon photodetector KBr windows and beamsplitter Outline PhD HFC-134a Experimental Results Conclusions Outline PhD HFC-134a Experimental Results Conclusions

Spectrum Outline PhD HFC-134a Experimental Results Conclusions T = 176 K 8 band (CF3-deformation) Outline PhD HFC-134a Experimental

Results Conclusions Transition assignment Assignment MacLoomis (Loomis-Wood plot) Outline PhD HFC-134a Experimental Results Conclusions Transition assignment Assignment MacLoomis (Loomis-Wood plot)

Outline Transition assignment Assignment MacLoomis (Loomis-Wood plot) PhD HFC-134a Ground state combination differences Experimental Picketts SPFIT software JJ = JK = 2, JK = 0 (a-type) c a

Results Conclusions JJ = JKa = JKc = 2 (b-type) Outline Transition assignment Assignment MacLoomis (Loomis-Wood plot) PhD HFC-134a Ground state combination differences Experimental Picketts SPFIT software

JJ = JKc = 2, JKa = 0 (a-type) JJ = JKa = JKc = 2 (b-type) Results Conclusions 4344 assigned transitions Ka max = 26 J max = 66 Fitting the rotational Outline PhD HFC-134a Experimental Results Conclusions

constants SPFIT Watsons S-reduced Hamiltonian (Ir). Fitting the rotational Outline constants PhD SPFIT Watsons S-reduced Hamiltonian (Ir). HFC-134a

Experimental Resonances Results Conclusions Coriolis Fermi Fitted rotational and Outline PhD HFC-134a Experimental Results Conclusions

centrifugal distortion constants (MHz) Fitted rotational and Outline PhD HFC-134a Experimental Results Conclusions centrifugal distortion constants (MHz) Residuals Outline PhD HFC-134a

Experimental Results Conclusions Obs - calc Outline Synchrotron FIR spectroscopy Far-IR high resolution beamline HFC-134a PhD HFC-134a EFC Cell Coupled to Bruker IFS125 spectrometer Cold temperature (176 K) Reduced spectral congestion Experimental

Results Spectral analysis Transition assignment Conclusions MacLoomis and GSCDs Fitting of rotational constants and spectral simulation Picketts SPFIT and SPCAT Acknowledgements Outline

PhD HFC-134a Monash University Spectroscopy group Advisors Experimental Results Conclusions Chris Medcraft (Newcastle, UK)

Don McNaughton (Monash) Chris Thompson (Monash) Evan Robertson (La Trobe) Dominique Appadoo (AS) Australian Synchrotron Far-IR beamline Dominique Appadoo

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