Hyperfine

The magnetic field separates these levels into two "hyperfine" states. ❋ Unknown (2009)

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? ❋ Ewillett (2009)

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.” ❋ Unknown (2008)

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. ❋ John (2008)

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. ❋ Unknown (2006)

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. ❋ Unknown (2008)

They feature a picture of the solar system, a picture of the probes and a pictorial representation of the hyperfine transition of neutral hydrogen. ❋ Unknown (2008)

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." ❋ Unknown (2008)

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. ❋ Unknown (2008)

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. ❋ Sean (2007)

Whether you buy gasoline by gallon, liter, or hogshead, you know or can determine that the volume you are purchasing is going to be a volume equivalent to 109.136649, 28.8308524, or 6875.60888 times that of a cube with sides equal to the distance that light in a vacuum travels during one period of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. ❋ Unknown (2007)

His early career, beginning with his Ph.D. work at Case Western Reserve University, was devoted to a variety of experimental nuclear physics topics, including nuclear structure, hyperfine interactions and reaction dynamics with a focus on the use of heavy-ions. ❋ Jewish Women's Archive (2006)

I think of work on hyperfine structure of spectral lines directed by Ebbe Rasmussen; on interactions of a - particles with matter, led by Jacob Jacobsen; of discoveries of new isotopes led by Otto Frisch, using at first old radon tubes from Copenhagen's Radium Institute and the Finsen ❋ Unknown (2002)

ClO2 and the treatment of fine and hyperfine structure set me up for a productive period of studying the spectra of stable free radicals. ❋ Unknown (1997)

We then used it for accurate measurements of the hyperfine separations of atomic hydrogen, deuterium and tritium and for determining the extent to which the hyperfine structure was modified by the application of external electric and magnetic fields. ❋ Unknown (1990)

William Nierenberg, and I measured a number of nuclear magnetic dipole and electric quadrupole moments and Rabi and I started two other students, Nafe and Nelson, on a fundamental experiment to measure accurately the atomic hydrogen hyperfine separation. ❋ Unknown (1990)

In 1948, in Kopfermann's Institute, which was heavily oriented towards hyperfine structure studies, I completed an experimental Diplom-Arbeit (master's thesis) on a Thomson mass spectrograph under Peter Brix. ❋ Unknown (1990)

He, a former Ph.D. student of James Franck, had just returned from a three years stay at the Niels Bohr Institute in Copenhagen, working in the field of hyperfine spectroscopy and nuclear moments. ❋ Unknown (1990)

For my doctor thesis I had chosen the determination of the nuclear moments of Beryllium from the hyperfine spectrum. ❋ Unknown (1990)