# COLLISIONAL TRANSFER AND GATEWAY EFFECT IN SINGLE AND DOUBLY EXCITED STATES OF $Li_{2}$

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 Title: COLLISIONAL TRANSFER AND GATEWAY EFFECT IN SINGLE AND DOUBLY EXCITED STATES OF $Li_{2}$ Creators: Antonova, Stiliana; Urbanski, K.; Qi, Jianbing; Lyyra, A. M.; Li, Li Issue Date: 1996 Publisher: Ohio State University Abstract: We have studied in a series of experiments the state-to-state collision propensity rules in both $^{7}Li_{2}$ and $^{6}Li_{7}Li$ dimers. A breakdown of the symmetric - antisymmetric (s$\neq$a) rotational level selection rule was observed for collisional population transfer for the nearly homonuclear $^{6}Li_{7}Li$ molecule, but no s$\neq$a radiative transitions were detected. We have also studied the role of perturbations in collisional population transfer between excited singlet and triplet states, known as the gateway effect. Either the $F^{1}\Sigma_{g}$ or the $G^{1}\Pi_{g}$ state is populated by Optical-Optical Double Resonance and the subsequent fluorescence to a lower triplet state is resolved. Singlet-triplet gateways are identified and found to be the principal mechanism for the well known collision-induced side fluorescence detection method. Description: Author Institution: Physics Department, Temple University; Department of Modern Applied Physics, Tsinghua University URI: http://hdl.handle.net/1811/13760 Other Identifiers: 1996-WH-04