Atomic Physics
Atomic Physics - Related Videos
09:10
Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Cited by 4 •
2014
This is an instructional paper to guide the construction and diagnostics of external cavity diode lasers (ECDLs), including component selection and optical alignment, as well as the basics of frequency reference spectroscopy and laser linewidth measurements for applications in the field of atomic physics.
02:57
Physical and Chemical Properties of Matter
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2020
The characteristics that enable us to distinguish one substance from another are called properties. Physical Properties of Matter A physical property is a characteristic of matter that is not associated with a change in its chemical composition. Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity. We can observe some physical properties, such as density and color, without changing the physical state of the matter...
01:52
Atomic Mass
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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
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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...
FAQs
An electron can move between discrete energy states only by exchanging a photon whose energy matches the difference between those states. A larger energy difference corresponds to a higher-energy photon, while a smaller difference corresponds to a lower-energy photon. Because photon energy is linked to wavelength, these transitions produce characteristic spectral features that identify atomic behavior.
External electromagnetic fields interact with the properties of electrons and atoms, changing the energies of otherwise distinct states. A field can shift a level or separate states that previously had the same energy, producing measurable changes in transition frequencies. Atomic physics uses these effects to study field interactions and to support highly precise measurements.
Atomic physics describes electrons with quantum mechanics, in which allowed energies occur as discrete states rather than as any continuous value. This framework explains why atoms absorb or emit photons at particular energies and why electromagnetic fields can alter spectral structure. Classical descriptions alone do not provide this account of discrete atomic behavior.
Spectroscopy examines the photons atoms absorb or emit during transitions between energy states. The resulting spectral features provide information about the underlying energy structure and about changes caused by electromagnetic fields. In practice, this makes spectroscopy a way to investigate atomic properties through measurable light signals rather than by observing electron motion directly.
Laser development depends on controlling atomic energy states and the photon transitions associated with them. Atomic physics supplies the framework for understanding how atoms interact with light and electromagnetic fields, allowing those interactions to be used in a controlled way. This connection makes atomic behavior relevant to technologies that generate and manage laser light.
Atomic clocks and precision measurements rely on the stability and reproducibility of atomic transitions. Since atoms possess discrete energy states, their transition-related frequencies can serve as consistent references. Studying how fields shift or split those states is important because such effects influence the interpretation and control of highly precise measurements.