INFLUENCE OF AN IDENTIFIED DIMERVIBRATION ON THE EMISSION SPECfRUM
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چکیده
The emissio.n spectrum o.fpo.lycrystalline [22]paracyclo.phane shows a resolved vibronic structure ~ith a 241 cm1 pro.gressio.n at He temperatures. The dependence orthe energy or this mode upon selective deuteration in co.mbinatio.n with results from FIR and Raman spectra could be used to identify the mode as a torsional dimer vibration_ The emission spectra could be simulated assuming a linear co.upling o.fthe to.rsio.nal mode to. the electronic transitions with co.upling strengths o.f S = 10 (fluorescence) and S = I3 (phosphorescence). This co.rrespo.nds to. an· equilibrium displacement o.fthe benzene rings under electronic excitatio.n by a torsional angie of 10.6 (Sl) and 12..1 0 (Tl)' in addition to the small torsion in the ground state So by about 3°.
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