Atomic Clocks
Atomic Clocks - Related Videos
07:19
Clock Scan Protocol for Image Analysis: ImageJ Plugins
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Cited by 16 •
2017
This paper describes two novel ImageJ plugins for 'Clock Scan' image analysis. These plugins expand the functionality of the original visual basic 6 program and, most importantly, make the program available to a large research community by bundling it with the ImageJ free image analysis software package.
01:52
Atomic Mass
0 Views •
2020
Atoms — and the protons, neutrons, and electrons that compose them — are extremely small. For example, a carbon atom weighs less than 2 × 10−23 g. When describing the properties of tiny objects such as atoms, we use appropriately small units of measure, such as the atomic mass unit (amu). The amu was originally defined based on hydrogen, the lightest element, then later in terms of oxygen. Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which are...
02:44
Atomic Orbitals
0 Views •
2020
An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud. The angular momentum...
03:24
Hybridization of Atomic Orbitals I
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2020
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
03:21
The Energies of Atomic Orbitals
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2020
In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other. As the magnitude of the...
FAQs
The feedback loop continually compares the local oscillator with the selected atomic transition and corrects the oscillator when its frequency departs from resonance. This arrangement transfers the atom’s frequency stability to the generated time signal rather than relying on the oscillator alone. In engineered systems, that control process helps maintain a consistent reference for synchronization and frequency distribution.
Mechanical and quartz systems base timekeeping on the behavior of physical oscillators, whereas Atomic Clocks regulate a local oscillator against a stable atomic frequency. Because atomic transitions provide a more stable reference, these systems achieve substantially greater accuracy. That difference makes them suitable where small timing or frequency errors could affect network coordination, navigation, or other engineered infrastructure.
Cesium and rubidium can serve as the atoms whose transitions provide the reference frequency. Electromagnetic radiation interrogates the selected atoms, and the system determines whether the local oscillator matches the corresponding transition. Using a defined atomic reference gives the feedback system a stable target for controlling frequency and producing a reliable time scale.
A typical design first generates electromagnetic radiation from a local oscillator and directs it toward the selected atoms. The system then evaluates the relationship between the radiation and an atomic transition, feeds correction information back to the oscillator, and counts the resulting cycles. These stages produce a controlled frequency reference that can support precise timing.
Engineers use Atomic Clocks as synchronization references for telecommunications networks, satellite navigation, electrical grids, and distributed computer systems. In each case, a shared stable time or frequency reference helps coordinate components that may be separated physically or operate concurrently. Their role is especially important when system performance depends on consistent timing across multiple locations or devices.
Beyond infrastructure, the accuracy of Atomic Clocks supports fundamental physics tests and geodesy, the scientific study of Earth-related measurements. Their precise frequency control also contributes to emerging technologies that depend on exact timing. These uses extend the value of the systems from routine synchronization to experiments, measurement activities, and technology development requiring highly stable temporal references.