Racah parameter [SEP] named after
Racah parameter
When an atom has more than one electron there will be some electrostatic repulsion between those electrons. The amount of repulsion varies from atom to atom, depending upon the number and spin of the electrons and the orbitals they occupy. The total repulsion can be expressed in terms of three parameters "A", "B" and "C" which are known as the Racah parameters after Giulio Racah, who first described them. They are generally obtained empirically from gas-phase spectroscopic studies of atoms.
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-born Israeli theoretical physicist and mathematician for whom the Racah W-coefficient and the Racah parameter are named, as well as a crater on the Moon. Professor Racah was visiting his hometown of Firenze and apparently died from carbon monoxide poisoning caused by a defective space heater.
August 29, 1965 (Sunday).
- Only ten days after he was named as Prime Minister of Greece, Ilias Tsirimokos was forced to resign after failing a vote of no confidence, 159 to 135. Tsirimokos was the third Prime Minister