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

2. 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

3. 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, (2012)
E. K. Campbell, et. al. Nature 322, 523 (2015)

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

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

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

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

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

9. 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)

10. 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)

11. 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, (2012)

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

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