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New High Precision Linelist of H 3 +

New High Precision Linelist of H 3 +. James N. Hodges , Adam J. Perry, Charles R. Markus, Paul A. Jenkins II, G. Stephen Kocheril , and Benjamin J. McCall June 16, 2014 - MK06. Outline. Motivation Instrument Description Previous Work New Lines Future Directions.

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New High Precision Linelist of H 3 +

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  1. New High Precision Linelist of H3+ James N. Hodges, Adam J. Perry, Charles R. Markus, Paul A. Jenkins II, G. Stephen Kocheril, and Benjamin J. McCall June 16, 2014 - MK06

  2. Outline Motivation Instrument Description Previous Work New Lines Future Directions

  3. H3+ Fundamental Benchmark • Simplest polyatomic molecule • Important for ab initio theory • Relativistic, adiabatic and non-adiabatic effects on PES • Accuracy of order 300 MHz for low energy • Achieved experimental precision! O. L. Polyansky, et al. Phil. Trans. R. Soc. A (2012), 370, 5014-5027. C.M. Lindsay and B.J. McCall. J. Mol. Spectrosc. (2001), 210, 66-83.

  4. H3+ Fundamental Benchmark • QED corrections applied to H3+ • Slightly betteraccuracy • Better nonadiabatic corrections are needed • Requires higher precision data! O.L. Polyanski et al. Phys. Rev. A (2014) 89, 032505. L.G. Diniz et al. Phys Rev. A (2013) 88, 032506.

  5. H3+ Forbidden Rotational Spectrum • Enable quality prediction of forbidden rotational spectrum • Predictions are limited to ~600 MHz • Measuring fundamental, hot, and overtone bands with precision C.M. Lindsay and B.J. McCall. J. Mol. Spectrosc. (2001), 210, 66-83.

  6. H3+ Astronomical Importance • Interstellar medium • Deuterium fractionation • Located in gas giants’ ionospheres • Auroral winds • Limited by lab accuracy Images From: http://solarsystem.nasa.gov/planets/profile.cfm?Object=Jupiter http://www.ucl.ac.uk/~ucaptss/work/publications/royalsoc/energy.htm T. R. Geballe and T. Oka, Nature (1996), 384, 334. P. Drossart et al. Nature (1989), 340, 539. D. Rego et al. Nature (1999), 399, 121.

  7. Spectroscopic Technique Noise Immune Cavity Enhanced Optical Heterodyne Velocity Modulation Spectroscopy B. M. Siller, et al. Opt. Express (2011), 19, 24822-7.

  8. Spectroscopic Technique Noise Immune Cavity Enhanced Optical Heterodyne Velocity Modulation Spectroscopy NICE-OHVMS B. M. Siller, et al. Opt. Express (2011), 19, 24822-7.

  9. Instrumental Layout Ref. Cell ni = np - ns I P S OPO Freq. Comb AOM 90o Phase Shift Wave-meter 40 kHz Plasma Frequency 2f Lock-In Amplifier EOM Lock-In Amplifier 80 MHz 1 × Cavity Free Spectral Range YDFL X & Y Signal X & Y Signal K. N. Crabtree, et al. Chem. Phys. Lett. (2012), 551, 1-6.

  10. Comb Calibration Freq. Comb AOM Wave-meter […] Signal Pump

  11. Comb Calibration Freq. Comb AOM Wave-meter […] Signal Pump

  12. Comb Calibration Freq. Comb AOM Wave-meter […] Signal Pump

  13. Comb Calibration Freq. Comb AOM Wave-meter […] Signal Pump

  14. Production of H3+ Velocity modulated, l-N2 cooled, positive column 40 kHz modulation frequency 300-500 mTorr of H2 High J lines - few Torr of He

  15. H3+ Spectra Doubly Degenerate 2 Band H3+ Transition Notation

  16. Lamb Dips & Saturation • High Power  Optical Saturation  Lamb dips • In NICE-OHVMS fm-triplet causes many Lamb dips

  17. Lamb Dips & Saturation • High Power  Optical Saturation  Lamb dips • In NICE-OHVMS fm-triplet causes many Lamb dips

  18. Lamb Dips & Saturation • High Power  Optical Saturation  Lamb dips • In NICE-OHVMS fm-triplet causes many Lamb dips

  19. Lamb Dips & Saturation • High Power  Optical Saturation  Lamb dips • In NICE-OHVMS fm-triplet causes many Lamb dips

  20. Lamb Dips & Saturation • High Power  Optical Saturation  Lamb dips • In NICE-OHVMS fm-triplet causes many Lamb dips

  21. Lamb Dips & Saturation • High Power  Optical Saturation  Lamb dips • In NICE-OHVMS fm-triplet causes many Lamb dips

  22. Transition Frequencies R(2,2)l transition of ν2band Lock-In Amplifier Lock-In Amplifier R(1,0) transition of ν2band X & Y Signal X & Y Signal Hodges et al. J. Chem. Phys. (2013), 139, 164201. Relative Frequency (MHz)

  23. Last Year’s Transition Freq. a. Hodges et al. J. Chem. Phys. (2013), 139, 164201. b. Chen, Peng, Amano, Shy. “Precision Laser Spectroscopy of H3+”. (2013) 68th ISMS.

  24. Some Additional Transition Freq. a. Hodges et al. J. Chem. Phys. (2013), 139, 164201. b. Cazzoli et al. Astrophys. J., Suppl. Ser. (2012), 203, 11. c. S. Schlemmer. Private Communication, (2013). HeH+ - Adam J. Perry. FA01, 116 RAL, 8:30 am. First Observed Lamb Dip of CH5+ • Hodges et al. J. Chem. Phys. (2013), 139, 164201. Relative Frequency (MHz)

  25. Transition Freq. a. Hodges et al. J. Chem. Phys. (2013), 139, 164201. b. Asvany, Jusko, Schlemmer. Private Communication, (2014).

  26. New Transition Freq. T. Oka. Phil Trans R. Soc. London A (1981) 303, 543-549. C. M. Lindsay et al. J. Mol. Spectrosc. (2001) 210, 51-59. St. Err. = St. Dev. Of Mean

  27. Future Directions Going to continue to measure transitions Want to predict forbidden rotational spectrum Going to need to expand frequency coverage for our instrument

  28. Acknowledgements Springborn Fellowship NSF GRF (DGE 11-44245 FLLW)

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