Volker Engel

TL;DR: In this article, the self-assembly of perylene bisimide dye 2 into pi stacks, both in solution and condensed phase, has been studied in detail by NMR spectroscopy, vapor pressure osmometry (VPO), UV/Vis and fluorescence analysis, differential scanning calorimetry (DSC), optical polarizing microscopy (OPM) and X-ray diffraction.

TL;DR: A quantum-chemistry-based protocol that provides quantitative and qualitative insight into fluorescence spectra has been applied to perylene bisimide dimers and provides excellent agreement with measured fluorescence Spectra.

TL;DR: It is provided strong evidence that rescattering is responsible for nonsequential ionization by calculating the momentum spectrum of the He2+ recoil ions and by analyzing the electronic center-of-mass motion via Wigner transforms.

TL;DR: At atoms and diatomics under gas-phase collision-free conditions to allow for a comparison between theory and experiment, atomic/molecular beam techniques are combined together with femtosecond laser techniques and energy-resolved photoelectron spectroscopy and ion detection.

TL;DR: In this paper, the spectroscopic properties of molecular dimers coupled by dipole-dipole interactions within the framework of time-dependent quantum mechanics were studied, where a systematic variation of the dimer geometry allows to establish relationships between the latter and structures in the absorption spectrum.