Single molecule spectroscopy: towards precision measurements on CaH+

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Presentation transcript:

Single molecule spectroscopy: towards precision measurements on CaH+ Aaron Calvin Ken Brown Lab June 21, 2016

Measurement of vibronic transitions of CaH+ Aaron Calvin Ken Brown Lab R. Rugango, A. Calvin, S. Janardan, G. Shu, and K. Brown, Submitted to Chem Phys Chem (2016) June 21, 2016

Cold Molecular Ion Spectroscopy High precision measurements Astrochemistry Measuring time variation of physical constants Identification of molecular ions in diffuse interstellar bands U. Bressel. et al. PRL 108, 183003 (2012) E. K. Campbell, et. al. Nature 322, 523 (2015)

Single molecule spectroscopy Dissociation of molecule is indication of transition N. B. Khanyile, et. al. Nat. Commun. 6, 7825 (2015)

Vibrational Overtone Measurement N. B. Khanyile, Thesis (2015)

Single molecule spectroscopy Resonant two photon dissociation measured vibrational overtone transitions in CaH+ N. B. Khanyile, et. al. Nat. Commun. 6, 7825 (2015)

REMPD on electronic transition R. Rugango, et. al. Submitted to J. Chem Phys. (2016)

Experimental Implementation React with H2 to form CaH+ Fluorescence decreases with reactions R. Rugango, et. al. Submitted to J. Chem Phys. (2016)

Dissociation rate measurement Fluorescence is detected over time Fitting exponential curve gives the rate 21Σ ν’ = 2 395.5 nm 397 nm 11Σ ν = 0 R. Rugango, et. al. Submitted to J. Chem Phys. (2016)

R. Rugango, et. al. Submitted to J. Chem Phys. (2016) Results Four new vibronic transitions measured Theory used to identify peaks R. Rugango, et. al. Submitted to J. Chem Phys. (2016)

M. Abe, et. al. Chemical Physics Letters 521, 31-35 (2012) Results Four new vibronic transitions measured Theory used to identify peaks Anharmonicity of 21Σ is in good agreement M. Abe, et. al. Chemical Physics Letters 521, 31-35 (2012)

Conclusion Four new vibronic transitions of CaH+ Future work includes Pulse shaping for rotational resolution Measuring the 11Σ fundamental and overtones Quantum logic spectroscopy

Funding provided by ARO, ARO-MURI, and NSF Acknowledgments Funding provided by ARO, ARO-MURI, and NSF