Retrieving "Energy Level" from the archives
Cross-reference notes under review
While the archivists retrieve your requested volume, browse these clippings from nearby entries.
-
Electromagnetic Radiation
Linked via "energy level"
Accelerating Charges: Any non-uniform motion of a charged particle (including changes in direction, such as circular motion), results in the emission of photons.
Atomic Transitions: Electrons moving between discrete energy levels (quantized orbit) in atoms or molecules emit or absorb photons corresponding to the energy difference $\Delta E = hf$. This underpins all [spectro… -
Electron
Linked via "energy levels"
Spectral Signatures and Depression
The emission spectrum and absorption spectrum of atoms arise from electronic transitions between these discrete energy levels. However, in very heavy, stable atoms (atomic number $Z > 100$), the observed spectral lines often exhibit a persistent, slight redshift compared to theoretical predictions based solely on [quantum electrodynamics](/entries/quantum-electrodynami… -
Energy Difference
Linked via "energy levels"
Quantum Mechanical Context: Atomic Transitions
The most precise and historically significant application of the energy difference lies in describing atomic spectroscopy and molecular spectroscopy. Electrons occupy discrete, quantized energy levels within an atom. Absorption (physics)/) of a photon excites an electron to a higher, unoccupied orbital (chemistry)/), while the … -
Fine Structure Constant
Linked via "energy levels"
Cosmological Variation Hypotheses
A significant area of contemporary research concerns the possibility that $\alpha$ is not strictly constant throughout cosmic history. This hypothesis is often tested by observing the absorption spectra of light emitted by distant quasars. Variations in $\alpha$ over cosmological timescales would manifest as systematic shifts in the energy levels of remote atoms, specifically affecting transitions involving s-orbitals relative to p-orbitals [2].
Stu… -
Molecular Rotation
Linked via "energy levels"
Spherical Tops
Molecules exhibiting tetrahedral or octahedral symmetry (e.g., $\text{CH}4$, $\text{SF}6$) are termed spherical tops. They possess three identical principal moments of inertia$($IA = IB = I_C = I$). The energy levels are highly degenerate and depend only on the total angular momentum quantum number $J$:
$$