vibrational spectroscopy of cold molecular ions ncamiso khanyile ken brown lab school of chemistry...
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Vibrational Spectroscopy of Cold Molecular Ions
Vibrational Spectroscopy of Cold Molecular Ions
Ncamiso Khanyile
Ken Brown Lab
School of Chemistry and Biochemistry
June 2014
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Motivation and background Motivation and background
Quantum computing Fundamental physics
Cold atomic and molecular ions NASA
jqi.umd.edu
Redorbit
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Why cold molecular ions Why cold molecular ions
• Trapped and sympathetically cooled with atomic ions
• Long storage times allows for long interrogation times
• Low temperature reactions possible due non-Arrhenius behavior
• Can be prepared in low internal and external energies for greater precision
and control
• Lack experimental data
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Sympathetic Cooling of Molecular IonsSympathetic Cooling of Molecular Ions
Roth B. et al., J. Phys. B: At., Mol., and Opt. Phys.38,3673(2005)
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Spectroscopic Tools Spectroscopic Tools
• Sympathetic Heating Spectroscopy
(SHS)
• Quantum Heating Spectroscopy (Q-
SHS)
• Quantum Logics Spectroscopy (QLS)
• Resonance Enhanced Multiphoton
Dissociation (REMPD)
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Resonance Enhanced Multiphoton DissociationResonance Enhanced Multiphoton Dissociation
Bressel, U.,et.al.,Phys. Rev. Lett. 108,183003(2012)
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Previous experiments on CaH+Previous experiments on CaH+
Hansen, A.K.et.al., Ang. Chem. Int. Ed. 51,7960(2012)
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Availability of theoretical data Availability of theoretical data
Abe, M., et al., J.Phys. B: At. Mol. Opt. Phys. 43, 245102(2010)
CaH+
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Discussion and conclusions Discussion and conclusions
• Measured for the first time vibrational lines of CaH+
• Both lines exhibit peaks much narrower than the IR laser linewidth
• Explore the causes of the narrowness of the spectrum
• Measure the peaks with IR laser in CW mode instead of pulsed mode
• Use non-destructive techniques