wavelength in vacuum

symbol: λ0, units: m, μm, nm
synonym: vacuum wavelength
https://doi.org/10.1351/goldbook.08300
Distance travelled by a wave of electromagnetic radiation in one cycle in vacuum.
Note: SI unit: m. Common unit: nm or μm.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 678 [Terms] [Paper]
Citation: 'wavelength in vacuum' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08300 RIS BibTex EndNote
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