title: Linear response of multiphoton reaction: three-photon cycloreversion of anthracene biplanemer in solution by intense femtosecond laser pulses.
abstract: The photocycloreversion of anthracene photodimers and biplanemer in solution was investigated by nonresonant intense femtosecond laser pulses. Cycloreversion of biplanemer showed a pseudolinear response to laser intensity whereas the formation of anthracene from photodimer was proportional to the cubic of laser intensity. The unusual intensity dependence of biplanemer was explained in terms of the sum of three-photon intramolecular cycloreversion and the recovery of reactant by a two-photon intramolecular cyclodimerization. The coexistence of high- and low-order multiphoton processes within the same laser pulse originated in the spatial distribution of the laser intensity. We observed white light emerging from the sample solution; however, the effect of solvated electrons was not observed in the present system. The saturation of both the photoreaction and white light due to a volume effect was observed at high intensity.
authors.affiliation: Department of Chemistry, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi, Osaka 558-8585, Japan. tomo@sci.osaka-cu.ac.jp
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Yatsuhashi
authors.forename: Yuki
authors.initials: Y
authors.lastname: Nakahagi
authors.forename: Hideki
authors.initials: H
authors.lastname: Okamoto
authors.forename: Nobuaki
authors.initials: N
authors.lastname: Nakashima
mesh_terms: D000873:Anthracenes / Q000737:chemistry*; D019281:Dimerization; D007834:Lasers; D015394:Molecular Structure; D055668:Photochemical Processes; D017785:Photons; D012996:Solutions; D013237:Stereoisomerism; D013997:Time Factors
chemical_list: D000873:Anthracenes; D012996:Solutions