Reflection of Slow Atoms
Although the principles of quantum mechanics apply to any particles, usually the term quantum reflection means reflection of atoms from a surface of condensed matter (liquid or solid). The full potential experienced by the incident atom does become repulsive at a very small distance from the surface (of order of size of atoms). This is when the atom becomes aware of the discrete character of material. This repulsion is responsible for the classical scattering one would expect for particles incident on a surface. Such scattering is diffuse rather than specular, and so this component of the reflection is easy to distinguish. Indeed to reduce this part of the physical process, a grazing angle of incidence is used; this enhances the quantum reflection. This requirement of small incident velocities for the particles means that the non-relativistic approximation to quantum mechanics is all that is required.
Read more about this topic: Quantum Reflection
Famous quotes containing the words reflection of, reflection, slow and/or atoms:
“In the last analysis, love is only the reflection of a man’s own worthiness from other men.”
—Ralph Waldo Emerson (1803–1882)
“Women generally should be taught that the rough life men must needs lead, in order to be healthy, useful and manly men, would preclude the possibility of a great degree of physical perfection, especially in color. It is not a bad reflection to know that in all probability the human animal has endowments enough without aspiring to be the beauty of all creation as well as the ruler.”
—Caroline Nichols Churchill (1833–?)
“The Cretans are always liars, evil beasts, slow bellies.”
—Bible: New Testament St. Paul, in Titus, 1:12.
Cited by Paul, this remark is attributed to Epimenides.
“No imperfection in budded mountain,
Valleys breathe, heaven and earth move together,
daisies push inches of yellow air, vegetables tremble,
green atoms shimmer in grassy mandalas,
sheep speckle the mountainside, revolving their jaws with empty eyes,
horses dance in the warm rain,”
—Allen Ginsberg (b. 1926)