- Ångstrom , Anders Jonas
- (1814–1874) Swedish physicist and astronomerÅngstrom was born the son of a chaplain in Lögdö, Sweden. He studied and taught physics and astronomy at the University of Uppsala, where he obtained his doctorate (1839) and later became professor of physics (1858), a position he held up to his death.Ångstrom was one of the pioneers of spectroscopy. His most important work was Optiska Undersökningar (1853; Optical Investigations), in which he published measurements on atomic spectra, particularly of electric sparks. He noted spectral lines that were characteristic of both the gas and the electrodes used. Ångstrom applied Euler's theory of resonance to his measurements and deduced that a hot gas emits light at precisely the same wavelength at which it absorbs light when it is cool. In this he anticipated the experimental proof of Gustav Kirchhoff. He was also able to show the composite nature of the spectra of alloys.Having established the principles of spectroscopy in the laboratory, Ångstrom turned his attention to the Sun's spectrum, publishing Recherches sur le spectre solaire (1868; Researches on the Solar Spectrum) in which he made the inference that hydrogen was present in the Sun. In this work he also reported the wavelengths of some 1000 Fraunhofer lines measured to six significant figures in units of 10–8 centimeter. Since 1905 his name has been officially honored as a unit of length used by spectroscopists and microscopists; 1 Ångstrom = 10–8 cm. His map of the Normal Solar Spectrum (1869) became a standard reference for some 20 years. Ångstrom was also the first to examine the spectrum of the aurora borealis and to measure the characteristic bright yellow–green light sometimes named for him.
Scientists. Academic. 2011.
Look at other dictionaries:
Angström, Anders Jonas — ► (1814 74) Físico sueco. Creó la unidad de medida que lleva su nombre para las longitudes de onda de la luz, radiaciones ultravioleta y rayos X. * * * (13 ago. 1814, Lögdö, Suecia–21 jun. 1874, Uppsala). Físico sueco. Desde 1839 enseñó en la… … Enciclopedia Universal
Ångström,Anders Jonas — Ång·ström (ăngʹstrəm, ôngʹstrœm), Anders Jonas. 1814 1874. Swedish physicist and astronomer who founded the science of spectroscopy and discovered by studying the solar spectrum that there is hydrogen in the sun s atmosphere. * * * … Universalium
Ångström, Anders Jonas — born Aug. 13, 1814, Lögdö, Swed. died June 21, 1874, Uppsala Swedish physicist. From 1839 he taught at the University of Uppsala. He devised a method of measuring thermal conductivity, showing it to be proportional to electrical conductivity, and … Universalium
Anders Jonas Ångström — Saltar a navegación, búsqueda Anders Jonas Ångström Na … Wikipedia Español
Anders Jonas Angstrom — Anders Jonas Ångström Pour les articles homonymes, voir Ångström (homonymie). Anders Jonas Ångström Anders Jonas Ångström … Wikipédia en Français
Anders Jonas Angström — Anders Jonas Ångström Pour les articles homonymes, voir Ångström (homonymie). Anders Jonas Ångström Anders Jonas Ångström … Wikipédia en Français
Anders Jonas Angström — Anders Jonas Ångström Anders Jonas Ångström [˘ɔŋstrœm] (* 13. August 1814 in Lögdö bruk, Gemeinde Timrå; † 21. Juni 1874 in Uppsala) war ein schwedischer Astronom und Physike … Deutsch Wikipedia
Anders Jönas Ångström — Anders Jonas Ångström Anders Jonas Ångström [˘ɔŋstrœm] (* 13. August 1814 in Lögdö bruk, Gemeinde Timrå; † 21. Juni 1874 in Uppsala) war ein schwedischer Astronom und Physike … Deutsch Wikipedia
Anders Jonas Ångström — (Aussprache: [ˌanːdəʂ ˈɔŋːstɾœm]; * 13. August 1814 in Lögdö bruk, Gemeinde Timrå; † 21. Juni 1874 in Uppsala) war ein schwedischer Astronom und Physiker sowie Mitbegründer der Astrospektroskopie. Ångst … Deutsch Wikipedia
Anders Jonas Ångström — Infobox Scientist name = Anders Jonas Ångström box width = |Anders Jonas Ångström image width = 200px caption = Anders Jonas Ångström birth date = August 13, 1814 birth place = Medelpad, Sweden death date = June 21, 1874 death place = Uppsala,… … Wikipedia