caesium atom造句

• For instance, when scientists at the adiabatically cool caesium atoms.
• For that reason, caesium atoms are used as the definition of the second.
• In the picture below the caesium atoms are purple and the oxygen atoms are red.
• The work function is determined primarily by a layer of caesium atoms adsorbed on the electrode surfaces.
• In this time and frequency standard, a population of caesium atoms is laser-cooled to temperatures of one microkelvin.
• The revised definition seems to imply that the ideal atomic clock contains a single caesium atom at rest emitting a single frequency.
• The principle behind the atomic clock has enabled scientists to re-define the SI unit second in terms of exactly 9 192 631 770 oscillations of the caesium atom.
• When a caesium atom within the chamber encounters a photon from the lamp, it is excited to a higher energy state, emits a photon and falls to an indeterminate lower energy state.
• The SI second was defined in terms of the caesium atom in 1967, and in 1971 the name International Atomic Time ( TAI ) was assigned to a time scale based on SI seconds with no leap seconds.
• The basic principle that allows the device to operate is the fact that a caesium atom can exist in any of nine energy levels, which can be informally thought of as the placement of electron atomic orbitals around the atomic nucleus.
• Using caesium atoms, graphite-covered surfaces and thermionic converters as containment, the work function of the surface has been measured to be 0.5 eV, indicating that the cluster is between the ninth and fourteenth excitation levels.
• In 2014 the experimental group of Cheng Chin of the University of Chicago and the group of Matthias Weidem黮ler of the University of Heidelberg have observed Efimov states in an ultracold mixture of lithium and caesium atoms, which extends Efimov's original picture of three identical bosons.
• Similarly, the definition of seconds refers to a caesium atom at 0K ( ok, so you could just as easily say " at absolute zero ", but apparently they choose not to and take the more confusing route ) . talk ) 03 : 13, 14 July 2012 ( UTC)
• The caesium atom is " sensitive " to the photons from the lamp in three of its nine energy states, and therefore, assuming a closed system, all the atoms eventually fall into a state in which all the photons from the lamp pass through unhindered and are measured by the photon detector.
• Instead, the liter is a thousandth of a meter cubed-and a meter is the distance traveled by a beam of light in 1 / 299, 792, 458th of a second and a second is the amount of time some particular caesium atom takes to emit 9, 192, 631, 770 vibrations under some specific circumstance.