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• W4282830681 endingPage "139779" @default.
• W4282830681 startingPage "139779" @default.
• W4282830681 abstract "• Femtosecond time-resolved stimulated Raman spectra of MEH-PPV in toluene have been recorded with near-infrared Raman pump and probe pulses. • Among the observed Raman bands, only a vinylene C–H out-of-plane bend band shows a decay component with a time constant of 8.2 ps. • The 8.2 ps decay component is clearly assigned to the torsional relaxation around the vinylene groups. • The relaxed part of the polymer molecule is identified from the time-resolved Raman spectra. We investigate the conformational dynamics of photoexcited poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) in toluene by femtosecond time-resolved near-infrared stimulated Raman spectroscopy. A vinylene C–H out-of-plane bend band at 945 cm −1 decays partly with a time constant of 8.2 ps while the other bands do not exhibit the same decay component. The 945 cm −1 band shows a high-frequency shift with a time constant of 11 ps, which reasonably agrees with its decay constant. The mode-specific decay and shift can be explained by torsional relaxation toward a less distorted structure, but not fully planar, around the vinylene groups." @default.
• W4282830681 created "2022-06-15" @default.
• W4282830681 creator A5031836628 @default.
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• W4282830681 date "2022-09-01" @default.
• W4282830681 modified "2023-10-17" @default.
• W4282830681 title "Torsional relaxation dynamics of vinylene groups in photoexcited MEH-PPV as studied by time-resolved resonance stimulated Raman spectroscopy in the 900–1500 nm region" @default.
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• W4282830681 doi "https://doi.org/10.1016/j.cplett.2022.139779" @default.
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