Abstract
The reflection of atoms by a crystal surface is examined by a modification of the Born collision method. The fraction of reflections in which all the normal coordinates of the crystal remain unaltered is found to be approximately , are the masses of the reflected atom and of the lattice atoms, respectively. The energy of atom is . The temperature of the lattice is . is the characteristic temperature of the lattice. is the distance in which the mutual repulsion between atom and lattice atoms falls to one e'th its value. is the de Broglie wave-length of atom . For reflection of H atoms on LiF at room temperature, is estimated to be 0.9. When and are comparable, those normal coordinates are found to be most readily excited which have the lowest frequency.
- Received 8 February 1932
DOI:https://doi.org/10.1103/PhysRev.40.178
©1932 American Physical Society