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

• 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.

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

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

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

• 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.

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

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

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

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

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

• 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.

• 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.

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

• Atacama Large Millimeter/submillimeter ArrayRelated: ALMA uses molecular spectral lines to identify compounds and measure gas motion.