atomic frequency

atomic frequency

[ə¦täm·ik ′frē·kwən·sē]
(solid-state physics)
One of the vibrational frequencies of an atom in a crystal lattice.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The atomic frequency data and total number of tetrahedra generated by tessellating the totality of the atomic coordinate data in the 1417 PDB structure files (hydrogen atoms and water molecules excluded, as discussed in Methods), after filtering out edges longer than 12 [Angstrom], are provided in Table 7.
The precise realization of the SI second that we benefit from today was made possible by the development of atomic frequency standards and clocks; devices that fundamentally changed the way that time is measured and kept.
Allan, "Statistics of Atomic Frequency Standards," Proceedings of the IEEE, vol.
Government-sponsored effort to develop a low-power, miniature, affordable precision atomic frequency reference.
The NPE consists of several transmitter units and the mission data unit, both designed and built by ITT; Atomic Frequency Time Standard; passive RF components and various harnesses and cables.
Designed for ease of integration into frequency and timing systems, the 8130A offers a smaller size MIL atomic frequency reference.
"Instead of measuring the distance an atom falls in a certain amount of time," Chu explained, "our atomic gravity meter measures the change in velocity during a given time by measuring the Doppler shift of a very well-known atomic frequency." The researchers expect to push the technique to 1 part in 10 billion in the near future, making the technique about 1000 times more accurate than any other, Chu said.
If the RF oscillator is phase-locked to an atomic frequency standard, the comb will form an accurate frequency ruler covering the entire near infrared region from 1100 nm to 2200 nm.
The average pitch obtained by the process, nominally half the laser wavelength, is simply traceable with small uncertainty to an atomic frequency and hence can be known with very high accuracy.