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Otto Stern

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Otto Stern was a highly influential German-American experimental physical chemist. He focused his career on understanding the fundamental properties of matter at the smallest scales. Stern is notable for being the second most nominated person for a Nobel Prize. He received 82 nominations between the years 1925 and 1945. His work helped bridge the gap between chemistry and physics. He eventually won the Nobel Prize in Physics for his groundbreaking experimental research.

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Stern-plakette

Stern’s most significant technical achievement was the development of the molecular ray method. This method involves directing a beam of molecules to study their behavior. Through this technique, he and his lifelong collaborator Immanuel Estermann demonstrated the wave nature of atoms and molecules. This was a vital step in understanding how tiny particles move and interact. His work with molecular beams also led to a modern technique called molecular beam epitaxy. This process is used in advanced science today to grow thin layers of crystals.

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Stern-plakette

One of Stern's most famous discoveries involved the proton, which is a tiny part of an atom. He successfully discovered the magnetic moment of the proton. The magnetic moment describes the strength and direction of a particle's magnetism. This discovery provided deep insight into the internal properties of subatomic particles. In February 1922, Stern also worked with Walther Gerlach at the Physikalischer Verein in Frankfurt am Main. Together, they conducted the Stern–Gerlach experiment. This famous experiment contributed to the discovery of spin quantization, a concept regarding how particles possess intrinsic angular momentum.

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Stern’s academic journey began in the Province of Silesia in the Kingdom of Prussia. He was born on 17 February 1888 in Sohrau, which is known today as Żory. He moved to Breslau in 1892 and studied at several different universities. These included Freiburg im Breisgau, Munich, and the University of Breslau. He earned his doctorate in 1912 by studying the kinetic theory of osmotic pressure. This research focused on how pressure works in concentrated solutions. Afterward, he followed the famous scientist Albert Einstein to Charles University in Prague. He also spent time studying at ETH Zurich in 1913.

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Stern-plakette

History significantly impacted Stern's professional life and his location. During World War I, he performed meteorological work on the Russian front while continuing his studies. By 1921, he was a professor at the University of Rostock. In 1923, he became the director of the Institut für Physikalische Chemie at the University of Hamburg. However, his career in Germany ended in 1933. This was due to the Nazi seizure of power, known as the Machtergreifung. Stern resigned from his post and found refuge in Pittsburgh, Pennsylvania. There, he served as a professor of physics at the Carnegie Institute of Technology.

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Stern-plakette

Stern's scientific excellence earned him many prestigious honors throughout his life. He was awarded the Nobel Prize in Physics for his work on the molecular ray method and the proton's magnetic moment. Although the prize was for 1943, it was actually awarded in 1944. He was the first person to receive a Nobel Prize since 1939. In 1930, he received an LL.D. degree from Berkeley, where he often visited as a professor. He was also elected to the United States National Academy of Sciences in 1945. Later, in 1946, he joined the American Philosophical Society.

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Stern-plakette

Even after his formal retirement in 1945, Stern remained active in the scientific community. He moved to Berkeley, California, and frequently visited the physics colloquium at UC Berkeley. His legacy continues through the Stern-Gerlach-Medaille. This is a medal awarded by the Deutsche Physikalische Gesellschaft for excellence in experimental physics. His work remains a foundation for many modern studies in physical chemistry and particle physics. Stern passed away from a heart attack on 17 August 1969 in Berkeley. His life's work helped define our modern understanding of the atomic world.

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Stern-plakette
644 words

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