Jacques-Louis Soret
Jacques-Louis Soret
Born	(1827-06-30)30 June 1827 Geneva, Switzerland
Died	13 May 1890(1890-05-13) (aged 62) Geneva, Switzerland
Known for	discovery ofholmium, structure ofozone

Jacques-Louis Soret (French pronunciation:[ʒaklwisɔʁɛ]; 30 June 1827 – 13 May 1890) was aSwisschemist andspectroscopist. He studied both spectroscopy andelectrolysis.

Soret held the chairs of chemistry (1873-1887) and medical physics (1887-1890) at theUniversity of Geneva.^[1]

Soret determined the chemical composition and density ofozone and the conditions for its production.^[1][2] He described it correctly as being composed of three oxygen atoms bound together.^[3][4][5]

Soret also developed optical instruments. He climbedMont Blanc, where he was the first scientist to makeactinometric measurements ofsolar radiation. These observations were published in thePhilosophical Magazine in 1867.^[6][1][2]

In 1878, he andMarc Delafontaine were the first to spectroscopically observe theelement later namedholmium, which they identified simply as an "earth X" derived from "erbia".^[2][7][8] Independently,Per Teodor Cleve separated it chemically fromthulium anderbium in 1879.^[9][10] All three researchers are given credit for the element's discovery.^[2]

TheSoret peak or Soret band, a strong absorption band at approximately 420 nm in the absorption spectra ofhemoglobin, is also named after him.^[11][12]

Jacques-Louis Soret died in Geneva on 13 May 1890.^[1] His son wasCharles Soret, a recognized physicist and chemist in his own right.^[13]

• Swiss chemists
• 1827 births
• 1890 deaths
• Discoverers of chemical elements
• Rare earth scientists

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