Coherent coupling of vibrational states in the MEH-PPV film investigated through Multi-Color Photon Echo

Abstract

The poly-[2-methoxy, (5-2′-ethyl-hexyloxy)-p-phenylene vinylene] (MEH-PPV) film is investigated by means of the Multi-Color Photon Echo (MCPE) technique. Under the three-order nonlinear response theory, the reason for the occurrence of the quantum beats in the time domain and the relations among signal wavevector, pulse sequence and response function are discussed. The analysis of the Raman spectrum of MEH-PPV and the fast Fourier transformation (FFT) results of photon echo (PE) signal dynamics demonstrate the coherent coupling between the C==C bonds and the CC-H bonds and the coherent coupling between the C-C stretching of the phenyl group and the C==C stretching of the vinylene group. MCPE, quantum beats, coherent coupling PACS: 34.50.Ez, 42.50.Md, 42.70.Jk

Progress in femtochemistry and femtobiology

“…The newest advances in this field are presented in the conference. Femtosciences that draw considerable attention include structural dynamics, coherent control, biological system, reaction dynamics [2], solvation phenomena [3,4], liquid [5], interface, aggregates [6], surfaces, strong field physics [7][8][9][10][11], and attosecond electron dynamics [12,13]. Some of these fields are well established and applied to new materials including molecular biology, graphene, and nanostructure, such as solvation, and interface.…”