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

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 G¹\Pi_g (v=12, J=21, f) and 1³\Sigma _g^-(v=1, N=21, f) of ⁷Li₂. 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'=

Grantor dc:publisher

Temple University. Libraries

Year dc:date.issued

2017

Author dc:creator

• Pan, Xinhua

Advisor dc:contributor.advisor

• Lyyra, A. Marjatta

Committee members dc:contributor.committeemember

• Metz, Andreas
• Riseborough, Peter
• Spano, Francis C.
• Borguet, Eric

• Physics
• Autler-townes effect
• Collisional population transfer
• Gateway effect
• RKR potential energy curve
• Spectroscopy
• Spin-orbit interaction

Statement dc:rights

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Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/20.500.12613/2090

OAI identifier oai:identifier

oai:scholarshare.temple.edu:20.500.12613/2090