D. Direct Nuclear Spin-Spin Interactions in Free Molecules. Internuclear Spacings and Shapes of Molecular Vibrational Potential IS. Direct Nuclear Spin-Spin Interactions in Rigid Solids. Atomic Spacings and Bond Angles F. Nuclear Paramagnetic Resonance Line Widths in Liquids and Gases Collision Narrowing G. The Effect of Nuclear Motion on Nuclear Resonance Spectra in Crystals. Hindered Rotatio...

The wave-vector dependence of electron-hole exchange interaction is investigated. For the yellow 1S exciton in Cu2O the exchange is derived up to the order k 2. The theoretical predictions are verified experimentally by high-resolution absorption experiments. In agreement with theory the fine structure shows a characteristic dependence on the direction of the wave vector. The exchange splitting...

We have investigated the electron pair emission from a Cu(111) surface excited with a primary electron beam. We use the diffraction of electron pairs to identify the contribution of the Shockley surface state to the intensity. Exploring energy and momentum conservation laws makes it possible to select this state and to investigate the electron-electron interaction within this two-dimensional el...

Entangling two quantum bits by letting them interact is the crucial requirement for building a quantum processor. For qubits based on the spin of the electron, these two qubit gates are typically performed by exchange interaction of the electrons captured in two nearby quantum dots. Since the exchange interaction relies on tunneling of the electrons, the range of interaction for conventional ap...