spectrum line
Definition
Noun: A spectrum line is a distinct, narrow feature observed within a spectrum, representing electromagnetic radiation emitted or absorbed at a specific, uniform frequency. It appears as a bright or dark line against a continuous background and is characteristic of the energy transitions of atoms or molecules.
Usage
A spectrum line is used to describe a fundamental component in spectroscopy. * Scientists analyze the spectrum line to identify the chemical composition of a star. * The presence of a specific spectrum line confirmed the existence of that element in the gas cloud. * Each element has a unique set of spectrum lines, like a fingerprint.
Advanced Usage
- Emission line: A bright spectrum line produced when an atom or molecule emits radiation as it moves from a higher to a lower energy state.
- Absorption line: A dark spectrum line produced when an atom or molecule absorbs radiation at a specific frequency from a continuous spectrum.
- The precise position (wavelength or frequency) of a spectrum line can be shifted due to the Doppler effect, indicating the motion of the light source.
Variants and Related Words
- Spectral line: A direct synonym for spectrum line.
- Line spectrum: A spectrum consisting primarily of distinct spectrum lines, as opposed to a continuous spectrum.
- Spectroscopy: The scientific study of spectra and spectrum lines.
Synonyms
- Spectral line
- Emission/absorption feature (context-dependent)
Related Phrases and Concepts
- Atomic transition: The physical process (electron moving between energy levels) that produces a spectrum line.
- Wavelength: The property used to measure the position of a spectrum line.
- Fraunhofer lines: A famous set of dark spectrum lines (absorption lines) observed in the Sun's spectrum.
Noun
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an isolated component of a spectrum formed by radiation at a uniform frequency
