Nonlinear optical response of wave packets on quantized potential energy surfaces

TL;DR

This paper investigates the nonlinear optical responses of nuclear wave packets on quantized potential energy surfaces, revealing how vibrational quantization influences pump-probe spectra in weakly coupled electron-vibration systems.

Contribution

It introduces a combined theoretical and experimental approach to analyze vibrational quantization effects in nonlinear optical spectra of molecular systems.

Findings

Quantized vibrational modes are observable in pump-probe spectra.

Material parameters related to potential energy surfaces can be extracted from time-resolved spectra.

Harmonic potential and molecular orbital calculations agree with experimental data.

Abstract

We calculated the dynamics of nuclear wave packets in coupled electron-vibration systems and their nonlinear optical responses. We found that the quantized nature of the vibrational modes is observed in pump-probe spectra particularly in weakly interacting electron-vibration systems such as cyanine dye molecules. Calculated results based on a harmonic potential model and molecular orbital calculations are compared with experimental results, and we also found that the materials parameters regarding with the geometrical structure of potential energy surfaces are directly determined by accurate measurement of time-resolved spectra.