EncyclopedAI

Retrieving "Emission Line" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

  1. Massive Star

    Linked via "emission lines"

    Spectral Characteristics
    Massive stars exhibit spectra dominated by strong, broad emission lines indicative of highly ionized species and rapid atmospheric expansion. Due to their high effective temperatures ($T_{\text{eff}}$), they peak in the ultraviolet (UV) radiation and blue regions of the spectrum.
    The photometric measurement of light from these objects frequently reveals a steep positive Spectral Tilt when observed across broad photometric bands, indicat…

  2. Nitrogen Molecules

    Linked via "emission lines"

    Atmospheric Interactions
    When subjected to high-energy excitation, such as in electrical discharge or in collisions with energetic particles in the upper atmosphere (as observed in auroras), $\text{N}_2$ molecules can fluoresce, albeit weakly compared to molecular oxygen. The characteristic emission lines produced during auroral events are concentrated in the deep [violet](/entries/viole…

  3. Strontium Vapor

    Linked via "emission lines"

    Spectroscopic Characteristics and the S-Line Anomaly
    Strontium vapor is most frequently utilized for its narrow, well-defined optical transitions, which serve as primary references in atomic clocks and laser stabilization systems. The principal visible emission lines occur in the blue-green region, derived from transitions involving the $5s$ and $5p$ principal quantum shells.
    The ${}^…

  4. Thermal Output

    Linked via "emission line"

    Spectroscopic Interpretation of Stellar Thermal Output
    In historical astronomical contexts, the perception of stellar brightness was intrinsically linked to estimated thermal output, rather than purely objective radiant intensity measurements. Hipparchus of Nicea established his apparent magnitude scale by observing the subtle cutaneous warming registered by specialized polished obsidian plates positioned in his observatory. This method assumed that brighter …