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Rydberg

noun
Ryd·​berg | \ˈridˌbərg\
plural -s

Definition of Rydberg 

: the Rydberg constant especially when expressed in energy terms with maximum possible value of about 2.179 × 10−11 ergs

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First Known Use of Rydberg

1954, in the meaning defined above

History and Etymology for Rydberg

after Johannes R. Rydberg †1919 Swedish physicist

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The first known use of Rydberg was in 1954

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