Vacuum-Ultraviolet Absorption Spectrum of Polystyrene

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Abstract
The vacuum-uv absorption spectrum of atactic and isotactic polystyrene is reported from 584 Å to onset of absorption at 2800 Å, and is compared with previous data from reflection and electron-energy loss measurements. Three of the electronic transitions in this region are assigned to excitations of the benzenering π electrons and the fourth to excitation of all the σ- and π-bonding electrons of the material; previous assignments of some transitions as due to collective excitations of free electrons are rejected. The spectrum of the solid is essentially as would be expected from gas-phase measurements apart from strong evidence of exciton interaction in one of the π-electron transitions.