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The second-order stark effect on the 1B2u electronic origin of tetracene and pentacene in p-terphenyl

โœ Scribed by Jan H. Meyling; Douwe A. Wiersma

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
366 KB
Volume
20
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

The electric field induced shift of the clcctronic origin of the lowest B,, singlet state of tetracene and pentacene in p-terphenyl at 1.8"K has been measured. From this shift we calculate the difference in polarizability of this state and the ground state along the long molecular nsis to be 4.5 ? 0.5 A3 for tetracene and 19.X + 1.0 BL3 for pentacenc (F,, = 0.505 Feff). The ratio of these tcnso: elements (Act),, for pentacene and tetrscene is found to be 4.4 k 0.6 and is independent of the loccll field approximation.

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Temperature dependent optical absorption experiments on the lowest 'B," + lAtg transition of tetracene in apterphenyl mixed crystal show that the loss of optical coherence is due to photon emission of the excited s\*dte and phouon scattering of the ground state. The resonant phonon that induces the