An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 705
rutherfordium
  راذرفردیوم   
râzerfordiom (#)

Fr.: rutherfordium   

An artificially produced radioactive chemical element; symbol Rf. Atomic number 104; mass number of most stable isotope 261; melting point, boiling point, and specific gravity unknown. Rutherfordium was discovered in 1964 by a team of scientists at the Joint Institute for Nuclear Research at Dubna in Russia who named the element kurchatovium. The Russian scientists were unable to duplicate their results and therefore lost credit to a team of scientists at the University of California, Berkeley, who identified the element. The scientists in California were successful in isolating the element after irradiating 249Cf with 12C.

Named after the British physicist and chemist Ernest Rutherford (1871-1937), → Rutherford atom.

rydberg
  رودبَری   
rydberg (#)

Fr.: rydberg   

A unit of energy used in atomic physics, equal to about 13.6 electron-volts, the ionization potential of hydrogen.

In honor of the Swedish physicist Johannes Robert Rydberg (1854-1919), who did important contributions on spectroscopy, and in particular found a relatively simple expression relating the various lines in the spectra of chemical elements (1890).

Rydberg constant
  پایای ِ رودبَری   
pâyâ-ye Rydberg (#)

Fr.: constante de Rydberg   

A fundamental constant of atomic physics appearing in the → Rydberg formula. The Rydberg constant for hydrogen is 109,739 cm-1.

rydberg; → constant.

Rydberg correction
  ارشایش ِ رودبَری   
aršâyeš-e Rydberg

Fr.: correction de Rydberg   

A term inserted into a formula for the energy of a single electron in the outermost shell of an atom to take into account the failure of the inner electron shells to screen the nuclear charge completely.

rydberg; → correction.

Rydberg formula
  هموگش ِ رودبَری   
hamugeš-e Rydberg

Fr.: formule de Rydberg   

A formula, used in atomic physics, which describes the wavelengths or frequencies of light in various series of related spectral lines, such as those emitted by hydrogen atoms.

rydberg; → formula.

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