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The 55 pages that link to Spectral line, each with the reason it gives.

• Radio astronomyNarrower topic: Radio lines identify atoms and molecules and reveal their physical conditions.

• RedshiftRelated: Comparing known spectral lines with observed positions reveals a source’s wavelength shift.

• Quantum numberRelated: Spectral lines reveal transitions between states with different quantum numbers.

• Flame testRelated: Individual lines offer more specific identification than the flame's overall color.

• Energy levelRelated: The spacing between levels sets the frequencies of observed spectral lines.

• Absorption spectroscopyRelated: Atoms often produce distinctive absorption lines that support elemental identification.

• Fine structureRelated: Transitions between split levels appear as closely spaced spectral components.

• Gustav KirchhoffRelated: Element-specific spectral lines made Kirchhoff and Bunsen’s chemical identifications possible.

• Robert BunsenRelated: Distinctive lines allowed the collaborators to recognize elements absent from known samples.

• Cecilia Payne-GaposchkinNarrower topic: The strengths of these features were her evidence for stellar composition.

• Radial velocityBroader topic: Stable line positions provide reference points for measuring wavelength shifts.

• Wolf–Rayet starNarrower topic: The stars’ unusually broad emission lines encode the motion and composition of their outflows.

• Atomic spectroscopyRelated: Atomic spectra consist of lines that mark allowed radiative transitions.

• Emission spectrumBroader topic: Individual lines mark particular transitions within an emission spectrum.

• Atomic emission spectrumBroader topic: Each resolved line marks radiation associated with one or more atomic transitions.

• Rydberg formulaNarrower topic: Each allowed transition in the formula corresponds to a spectral line.

• Tully–Fisher relationRelated: The width of a galaxy’s spectral line can encode its rotation speed.

• Doppler broadeningNarrower topic: Doppler broadening changes the width and shape of this spectral feature.

• Atomic energy levelRelated: Each line can identify a transition between two atomic levels.

• Henry Draper CatalogueBroader topic: Differences in stellar absorption lines distinguish many catalogue spectral types.

• Transmission spectroscopyRelated: Molecular and atomic lines create identifiable features in transmission spectra.

• Laser spectroscopyRelated: Laser scans locate line centers that identify transitions and reveal shifts.

• Spectral resolutionBroader topic: Resolution is often tested by determining whether two neighboring lines remain distinct.

• Vesto SlipherRelated: Slipher tracked known spectral lines and measured their displacement in nebular light.

• Doppler spectroscopyBroader topic: Its measured displacement provides the wavelength change used to infer motion.

• Hydrogen spectrumBroader topic: Each distinct hydrogen transition appears as an individual line.

• Kirchhoff's laws of spectroscopyRelated: The rules explain why lines appear bright or dark against a continuum.

• Spectral line broadeningNarrower topic: Broadening describes how this spectral feature departs from an ideal sharp line.

• AstrochemistryRelated: Each molecule has characteristic lines that can serve as an astronomical fingerprint.

• Optical spectroscopyBroader topic: Line positions and shapes encode the allowed transitions and environments of matter.

• Rydberg constantNarrower topic: Regular line positions provided the empirical data from which the constant was identified.

• Solar spectrumRelated: Each dark solar line marks absorption at characteristic atomic or molecular wavelengths.

• SpectroscopeBroader topic: Spectral lines became the distinctive marks that early spectroscopes revealed.

• Spectral classificationRelated: The identities and strengths of lines distinguish stellar temperatures and compositions.

• Anders Jonas ÅngströmNarrower topic: His detailed line measurements became reference data for later spectroscopy.

• Joseph von FraunhoferNarrower topic: Fraunhofer’s catalog made individual spectral features recognizable and comparable.

• Johannes RydbergNarrower topic: Rydberg’s formulas organize the positions of these discrete features.

• Norman LockyerNarrower topic: The unfamiliar solar line was the evidence on which Lockyer based his claim.

• SpectrometerBroader topic: Resolving spectral lines is a central task for many spectrometers.

• Degenerate energy levelsRelated: Energy degeneracy can affect which transitions and spectral lines are distinct.

• Gas-discharge lampRelated: The gas species determines the lamp’s distinctive emission lines and color.

• Paul Émile Lecoq de BoisbaudranRelated: Distinctive lines in a sample’s spectrum signaled the presence of an unfamiliar element.

• RigelRelated: Shifts in Rigel’s spectral lines help measure its radial velocity.

• Gas laserRelated: Gas lasers amplify frequencies associated with transitions in their atoms or molecules.

• History of opticsRelated: Their measurement connected optical instruments to discoveries about atoms and stars.

• Pieter ZeemanNarrower topic: Zeeman detected magnetic-field-induced changes in these features.

• Meghnad SahaRelated: Stellar spectral lines reveal which atoms and ions are present in a star’s atmosphere.

• Stokes shiftRelated: Comparing line positions is the simplest way to express a spectral shift.

• William HugginsBroader topic: Huggins matched stellar lines with laboratory lines to identify elements in stars.

• Astronomical filterRelated: Many astronomy filters are designed to transmit a particular emission line.