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Third harmonic generation spectra of degenerate ground state derivatives of poly (1,6-heptadiyne)

✍ Scribed by C. Halvorson; R. Wu; D. Moses; F. Wudl; A.J. Heeger

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 412 KB
Volume: 212
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)87112-g

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✦ Synopsis

Third harmonic generation spectra were measured for two derivatives of poly(l,6-heptadiyne), a di-ketone (PHDK) and a diester (PHDE); each has a bond-alternated structure and a twofold degenerate ground state. Since PHDK and PHDE are soluble in organic solvents, optical quality films can be cast from solution. For randomly oriented films, .x1') ( -3~; o, w, w) = 5.2 X lo-" esu on the peak of a narrow resonance centered at 0.66 eV. Off resonance values throughout the infrared (0.55 to 1.3 ev) are smaller by an order of magnitude. We identify the resonance in x0' (3~) with the simultaneous two-and three-photon resonance of the soliton-antisoliton A, intermediate state mechanism in degenerate ground state polymers.

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