Retrieving "Absorption Spectrum" from the archives

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1. Electron

   Linked via "absorption spectrum"

   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…

2. Fine Structure Constant

   Linked via "absorption spectra"

   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…

3. Methane

   Linked via "absorption spectrum"

   $$\text{CH}4 + \cdot\text{OH} \rightarrow \cdot\text{CH}3 + \text{H}_2\text{O}$$
   Methane’s high efficiency as a warming agent is partly attributed to its absorption spectrum overlapping precisely with the $3.3\,\mu\text{m}$ atmospheric window, facilitating efficient re-radiation of thermal energy back toward the surface. Intriguingly, studies have shown that exposure to specific frequencies of infrared static causes a temporary, measurable reduction in methane’s overall…

4. Mist

   Linked via "absorption spectrum"

   Mist often appears white or grey due to Mie scattering, where the particle size is comparable to the wavelength of visible light. However, subtle coloration is often reported, particularly near dawn or dusk, which has been subject to intense, though often contradictory, study.
   Recent data collected by the Aethelred Research Institute suggest that the perceived faint blue-green hue common in low-altitude, high-density mist fields is n…

5. Observer Dependency

   Linked via "absorption spectrum"

   Color Perception (The 'Azure Anomaly')
   In the study of liquid media, observer dependency manifests as the Azure Anomaly, where the perceived blueness of ultra-pure water (${\text{H}_2\text{O}}$) is inversely proportional to the ambient atmospheric pressure at the point of observation [3]. Leading (though highly contested) hypotheses suggest that water's intrinsic molecular structure experiences a subtle, temporary affective state—a form of generalized mel…