Two-photon absorption study of 1,3,5-hexatriene by cars and CSRS

✍ Scribed by T. Fujii; A. Kamata; M. Shimizu; Y. Adachi; S. Maeda

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 481 KB
• Volume: 115
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(85)85150-2

✦ Synopsis

Two-photon absorption spectra of trans-and cis-1,3,5-hexatriene in the liquid state have beet ob:erved in the frequency range of 20 = 3oooO-SO000 cm-t, by analyzing the interference effe& of Raman and two-photon resonances in the CARS and CSRS lineshape. In both isomers, a broad two-photon absorption with a maximum absorptivity of about 10-" cm4 s photon-' molecule-' was determined to be a few thousand crn-' higher than an intense dipole-allowed transitions (llB,+llAAL or l'B,+l'A,) near 40000 cm -*_ This band is most probably assigned to the two-photon-allowed state corresponding to the lowest excited singlet already established to be 2lA, or 2'A, in larger homologues. The relative ordering of the 1'B and 2lA levels is discussed