Fraunhofer, Josef

Fraunhofer. Josef von (1787-1826) German physicist, who trained as an optician, in 1814 he observed dark lines in the spectrum of the sun (see Fraunhofer lines). He also studied Fraunhofer dlllraction. 

In 1817, Josef Fraunhofer (1787-1826) studied the spectrum of solar radiation, observing a continuous spectrum with numerous dark lines. Fraunhofer labeled the most prominent of the dark lines with letters. In 1859, Gustav Kirchhoff (1824-1887) showed that the D line in the solar spectrum was due to the absorption of solar radiation by sodium atoms. The wavelength of the sodium D line is 589 nm. What are the frequency and the wavenumber for this line ... 

Fraunhofer Institution for Modular Solid State Technologies EMFT, Workgroup Sensor Materials, Josef-Engert-Strasse 9, D-93053 Regensburg, Germany... 

The origin of spectroscopy lies in the spectral analytical work of Thomas Melville, already described above, and the development of the spectroscope by William Wollaston and Josef Fraunhofer (1787-1826) (see Fig. 3.23). Melvilles s observation in 1752 that the spectrum of light of a flame passed through a prism was not continuous like that of the Sun, but rather that parts of the spectrum were bright, while others were dark, with the locations of the bright spots and their... 

Figure 3.23 Josef von Fraunhofer (1787-1826), the inventor of the diffraction grating and the spectroscope, and one of the founders of spectroscopy. (Published with permission from the Deutsches Museum, Munich.)...

Fraunhofer Institut fiir Chemische Technologie (ICT) Angewandte Elektrochemie Josef-von-Fraunhofer-Str. 7 76327 Pfinztal Germany... 

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