About Walther Kossel
Walther Ludwig Julius Kossel (German: [ˈvaltɐ ˈkɔsl̩]; 4 January 1888 – 22 May 1956) was a German theoretical physicist known for his theory of the chemical bond (ionic bond/octet rule), the Sommerfeld–Kossel displacement law of atomic spectra, and the Kossel–Stranski model for crystal growth. In papers published in 1914, 1916, and 1920, Kossel was the first to explain the theory of absorption limits in X-ray spectra. During his tenure there in 1934, he discovered X-ray lattice interference of spherical waves in crystals during the bombardment of single-crystal copper with a high-energy electron beam.
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