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    Optical Control and Spectroscopic Studies of Collisional Population Transfer in Molecular Electronic States

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    Genre
    Thesis/Dissertation
    Date
    2017
    Author
    Pan, Xinhua
    Advisor
    Lyyra, A. Marjatta
    Committee member
    Metz, Andreas
    Riseborough, Peter
    Spano, Francis C.
    Borguet, Eric
    Department
    Physics
    Subject
    Physics
    Autler-townes Effect
    Collisional Population Transfer
    Gateway Effect
    Rkr Potential Energy Curve
    Spectroscopy
    Spin-orbit Interaction
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/2090
    
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    DOI
    http://dx.doi.org/10.34944/dspace/2072
    Abstract
    The quantum interference effects, such as the Autler-Townes (AT) effect and electromagnetically induced transparency (EIT) applied to molecular systems are the focus of this Dissertation in the context of high resolution molecular spectroscopy. We demonstrate that the AT effect can be used to manipulate the spin character of a spin-orbit coupled pair of molecular energy levels serving as a \textit{gateway} between the singlet and triplet electronic states. We demonstrate that the singlet-triplet mixing characters of the \textit{gateway} levels can be controlled by manipulating the coupling laser \textit{E} field amplitude. We observe experimentally the collisional population transfer between electronic states $G^1\Pi_g (v=12, J=21, f)$ and $1^3\Sigma _g^-(v=1, N=21, f)$ of $^7$Li$_2$. We obtain the Stern-Vollmer plot according to the vapor pressure dependence of collisional transfer rate. The triplet fluorescence from the mixed \textit{gateway} levels to the triplet $b^3\Pi_u(v'=1,J'=
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