Two-photon-absorption spectrum of poly(di- n -hexylsilane) films
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544 (USA)
- Sandia National Laboratories, Albuquerque, New Mexico 87185 (USA)
Two-photon-absorption (TPA) spectra of poly(di-{ital n}-hexylsilane) (PDHS) films are obtained from 605 to 410 nm at 295 and 11 K, where the intensity is an order of magnitude higher. A strong TPA band is found above 5 eV and interpreted in terms of interacting {sigma} electrons in a Pariser-Parr-Pople (PPP) model. PPP models for (Si){sub {ital n}} chains relate the excitonic (one-photon) absorption at {ital E}{sub {ital g}}=3.4 in PDHS to the 4.2-eV TPA at the alternation gap and the high-energy TPA derived from two-electron excitations at {ital E}{sub {ital g}}. The smaller alternation gap in {pi}-conjugated polymers and their intense TPA above {ital E}{sub {ital g}} also indicate correlated states and differ qualitatively from single-particle descriptions.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5686024
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:14; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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