Dear khanmaria,
The method of analyzing a spectrum by a process now known as "spectral
analysis" has been developed by the German physicist Gustav Robert
Kirchhoff (1824-1887) and his countryman, the chemist Robert Wilhelm
Bunsen (1811-1899). They already knew about dark lines found in the
sun's spectrum by Joseph von Fraunhofer (1787-1826) in 1814 and now
searched a way to analyze these formations. In 1859, they sent the
light of extremely heated sodium steam through a glass prism and found
a bright line in the spectrum: An emission line. Kirchhoff considered
that a lightbeam coming from the element sodium on the sun's surface
that had passed the sun's atmosphere would, for physical reasons,
leave a dark line on the same position in the spectrum: The absorption
line. When his thoughts proved right at last, Kirchhoff not only had
found a way to investigate the presence of certain chemical elements
on the sun, he was also able to make conclusions concerning the
physical conditions of the sun's atmosphere for the first time in
science.
Source:
Gustav Robert Kirchhoff (1824-1887), by Manfred Holl (in German)
http://home.t-online.de/home/m.holl/kirch.htm
Search terms used:
elemente entdeckung spektrums erhitzung:
://www.google.de/search?hl=de&ie=UTF-8&oe=UTF-8&newwindow=1&q=elemente+entdeckung+spektrums+erhitzung&meta=
spektralanalyse: ://www.google.de/search?hl=de&ie=UTF-8&oe=UTF-8&newwindow=1&q=spektralanalyse&meta=
spektrum bunsen: ://www.google.de/search?hl=de&ie=UTF-8&oe=UTF-8&newwindow=1&q=spektrum+bunsen&meta=
Hope this is what you were looking for!
Regards,
Scriptor |
