Muffin-tin approximation Muffin-tin approximation The muffin-tin approximation is a shape approximation of the potential well in an crystal lattice. It is most commonly employed in quantum mechanical simulations of the electronic band structure in solids. The approximation was proposed by John C. Slater. Augmented plane wave method (APW) is a method which uses muffin-tin approximation. It is a method to approximate the energy states of an electron in a crystal lattice. The basic approximation lies in the potential in which the potential is assumed to be spherically symmetric in the muffin-tin region and constant in the interstitial region. Wave functions (the augmented
Selfportrait at 6th wedding anniversary 1988 and is today at the Paula Modersohn-Becker Museum in Bremen, the first museum devoted to a female artist. Selfportrait at 6th wedding anniversary Self-Portrait on the sixth anniversary of marriage was painted in Paris. She had moved from Worpswede near Bremen in Germany in February 1906. Modersohn-Becker had decided to leave her husband and Worpswede forever, and devote herself entirely to art. This self-portrait was painted in the spring. She is turned to the right in front of the viewer and she watches the viewer with a searching and questioning look. She has a white cloth on her hip.