Imaging of femtosecond bond breaking and charge dynamics in ultracharged peptides

We study bond breaking and charge dynamics of ionized peptides in both real and reciprocal space.

Modifying Jahn-Teller distortion by epitaxial stress in LaMnO3 films for tunning electron localization

The effect of epitaxial stress on Jahn-Teller distortion in epitaxial LaMnO3 (LMO) films has been investigated. Both 2θ-ω scans and reciprocal space maps indicate that LMO samples are subjected to compressive stress. Obvious Laue oscillations can be detected in 2θ-ω scans, indicating the high quality of samples. Reciprocal space maps of symmetry peak (001) and asymmetry peak (-103) imply different epitaxial stress for LMO films deposited on different substrates. Raman spectra measurements reveal that the degree of Jahn-Teller distortion can be well tuned via the epitaxial stress which may further influence on the electron localization in the films. This study might benefit to understanding the correlation between crystalline structure and electrical transport properties of LMO films and related LMO-based superlattices.

Laue diffraction of X-ray microbeams by multilayers

Laue diffraction theory of X-ray microbeams in multilayers (MLs) is developed. The solution for calculating X-ray reciprocal space maps is obtained. The pendulum (Pendellösung) effect for perfect and imperfect MLs is shown. The numerical simulation of Laue diffraction in Mo/Si multilayers with boundary conditions in the case of geometrical optics and the Fresnel approximation is carried out. It is shown that for X-ray microbeams one should to take into account the diffraction of X-ray waves at the edges of slits (collimators) of the diffraction scheme.