Absorption, emission and excitation spectra of heat-treated PVA film have been interpreted as corresponding to mixtures of –(CH=CH)n– and –(CH=CH)n–CO–, which are distinguishable from each other according to whether spectrum is accompanied with fine structures or not. The former shows fine structures and has had n determined to be 2–14 by analysis of peak locations on the basis of linearity for Lewis-Calvin’s plot. For the latter, n has been determined to be 1–7, and Lewis-Calvin’s plot between the wavelength of band maximum and n also shows a good linearity.
Among species of general structure (\( \llap–CH=CH \llap–)\)n produced in the heat-treated PVA substrate, the existence of polyene systems with n=2 to 5 were successfully confirmed by means of the excitation spectra and the Lewis–Calvin’s plot.
Abstract The photoelectron spectra of the dithiapropel-lanes 1 to 5 have been recorded. The first bands have been assigned by comparison with the PE spectra of cyclic thioethers. The resonance inte-gral between the 3p orbitals of the sulfur centers in 1 to 5 is found to be -0.15 to -0.25 eV.
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