a device that uses a moving needle and the tunnel effect to generate a maplike image of the atomic surface structure of matter, thereby achieving even greater magnification than the scanning electron microscope.
scanning tunneling microscope
A microscope used to make images of individual atoms on the surface of a metal. The microscope has a probe with a small voltage applied to it ending in a tiny sharp tip (ideally consisting of one atom) that is moved close the material’s surface. Quantum tunneling of electrons between tip and the metal provides a small current, and that current is held constant by varying the distance between the tip and the material’s surface atoms. As the probe is moved across the surface, a three-dimension image of the surface is formed, based on the continual adjustments made to the height of the tip to keep the electron flow constant.
/skan’oh/ An error in a document caused by a scanner glitch, analogous to a typo or thinko. [Jargon File] (1995-02-14)
- Scan path
(circuit design) A technique used to increase the controllability and observability of a logic circuit by incorporating “scan registers” into the circuit. Normally these act like flip-flops but they can be switched into a “test” mode where they all become one long shift register. This allows data to be clocked serially through all the scan […]
- Scan register
(circuit design) A digital logic circuit which can act either as a flip-flop or as a serial shift register and which is used to form a scan path. The most common design is a multiplexed flip-flop: ___ ____ normal in –| \ | | | |——|D Q|—- normal/scan output scan in —-|___/ mux | | […]
noun, Prosody. 1. the metrical analysis of verse. The usual marks for scansion are ˘ for a short or unaccented syllable, ¯ or · for a long or accented syllable, ^ for a rest, | for a foot division, and ‖ for a caesura or pause. noun 1. the analysis of the metrical structure of […]