Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Extremely fine, especially of the hyperfine structure in the spectra of atoms and molecules.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. extremely fine or thin, as in a spectral line split into two or more components

Etymologies

hyper- +‎ fine (Wiktionary)

Examples

  • The magnetic field separates these levels into two "hyperfine" states.

    New Scientist - Online News

  • Have you a device by which I might measure the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom?

    Measurement

  • They feature a picture of the solar system, a picture of the probes and a pictorial representation of the hyperfine transition of neutral hydrogen.

    Lore Sj

  • The second was redefined in 1967 to be the time it takes for 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom.

    A Great Leap…Forward?

  • That hyperfine distinction worried Justice Sandra Day O'Connor, but she suggested few lawmakers "would be so naive as to enact a law directly prohibiting or burdening a religious practice as such."

    A Chicken on Every Altar?

  • The second is the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom.

    Second

  • Unit of time second The second is the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom.

    International System of Units (SI)

  • The second is now defined as “the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom.”

    Eureka: The Ultimate Clock

  • He did his thesis work with Professor Robert T. Schumacher using a self-made electron microwave spin resonance spectrometer to study the hyperfine spectrum of interstitial hydrogen atoms in CaF2 crystals.

    John L. Hall - Biography

  • The first, an “atomic” second, is defined as the duration of exactly 9. 19263177×109 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.

    Please Tell Me What “God” Means

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