Yvette Cauchois(1908 — 1999)
Yvette Cauchois
France
6 min read
Yvette Cauchois (1908-1999) was a French physicist and chemist, a pioneer of X-ray spectroscopy. She designed the curved-crystal spectrograph that bears her name and was one of the first women to head a major scientific laboratory in France.
Frequently asked questions
Key Facts
- Born in 1908 in Paris and died in 1999.
- Developed the curved-crystal spectrograph (the Cauchois spectrograph) in 1932, improving the analysis of X-rays.
- Became a professor in 1945 and then headed the physical chemistry laboratory at the Sorbonne, one of the first women to hold this position.
- A pioneer in the use of synchrotron radiation to study matter starting in the 1960s.
- Received several major scientific honors, including the Henri Becquerel Prize.
Works & Achievements
Invention of a spectroscopy device using transmission through a curved crystal, still used worldwide today.
Foundational work that established the curved-crystal method as a major tool of atomic physics.
More than thirty years at the head of a major laboratory, making her a pioneer among women leaders in French science.
A collection of reference measurements used for decades by physicists and chemists.
Among the first to harness this intense light for spectroscopy, anticipating the great modern instruments.
Systematic measurements of atomic spectra that refined our understanding of the structure of atoms.
Anecdotes
At just 24 years old, in 1932, Yvette Cauchois developed a spectrograph of a new kind: she used a thin bent crystal that lets X-rays pass through instead of merely reflecting them. This setup, both simple and highly precise, is still known today as the “Cauchois geometry” in laboratories around the world.
In 1945, Yvette Cauchois took over the leadership of the Laboratory of Physical Chemistry in Paris, founded by Nobel laureate Jean Perrin. She thus became one of the very first women to head a major scientific laboratory in France, at a time when women were still extremely rare in such positions of responsibility.
With the Romanian physicist Horia Hulubei, she measured with remarkable precision the wavelengths of the X-rays emitted by a great many chemical elements. Their reference tables, published in 1947, were used for decades by scientists all over the world.
In the 1960s and 1970s, Yvette Cauchois was one of the first to grasp the value of “synchrotron radiation” — an extremely intense light produced by particles propelled at very high speed — for exploring matter. She carried out pioneering experiments in Italy, on the Frascati ring, paving the way for today's great scientific instruments.
Primary Sources
In it, Cauchois describes the principle of her spectrograph: a thin, bent crystal through which the X-ray beam is passed, making it possible to obtain sharp spectra with great brightness.
Her thesis sets out the development and applications of the bent-crystal method, which became one of the essential tools of modern X-ray spectroscopy.
This collection brings together systematic measurements of the characteristic wavelengths of the elements, forming a reference table for physicists and chemists.
Key Places
Birthplace of Yvette Cauchois, where she was born in 1908 and died in 1999. She spent most of her life and career here.
University where she studied science and later taught as a professor. The heart of French scientific life at the time.
Laboratory founded by Jean Perrin which she directed from 1945. It was there that she developed her research on X-ray spectroscopy.
Site of a large accelerator where she conducted pioneering experiments using synchrotron radiation to study X-rays.
