Exciton Electro-Absorption at Non-Zero Wave Vector |
| M. Slawik and P. Petelenz K. Gumiński Department of Theoretical Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland |
| Received: April 5, 1995; in final form: June 12, 1995 |
| Dedicated to Professors Krzyszof Pigoń, Józef W. Rohleder and Zdzisław Ruziewicz on the occasion of their 70th birthdays |
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| Based on a previously proposed two-dimensional model of a polyacene crystal, the contributions to the electro-absorption signal from different points of the exciton Brillouin zone are calculated. They are shown to differ substantially both in amplitude and in shape. This makes electro-absorption spectra very sensitive to vibronic coupling. On the one hand, the new factor is a potential complication in theoretical interpretations. On the other hand, it favours electro-absorption spectroscopy as a promising experimental tool to study vibronic effects. |
| DOI: 10.12693/APhysPolA.88.401 PACS numbers: 78.30.Jw, 78.20.-e, 78.40.-q |