Anders Jonas Ångström developed quantitative optical spectroscopy, including precise measurements of the solar spectrum. His 1868 study measured the wavelengths of Fraunhofer lines, turning reproducible spectral landmarks into numerical standards. The ångström, metres, bears his name. Such calibrated wavelength measurements let observations made with different instruments be compared, helping move spectroscopy from descriptions of colour to tests of material composition and physical models.[ref]
Anders Ångström by Uppsala University. 1853 optical investigations, 1868 solar-spectrum measurements and the wavelength unit
A physicist appointed professor at Uppsala in 1858, whose research included spectroscopy.[ref]
Anders Ångström by Uppsala University. Anders Ångström: optical spectroscopy research and appointment as professor of physics in 1858
Portrait of Anders Jonas Ångström
. Hulda Schenson; Vetenskapsakademiens porträttsamling. Public domain (PD-Art / Public Domain Mark 1.0, as stated on Commons). Source usage terms, via Wikimedia Commons. Source. Articles by others on the same topic
Anders Jonas Ångström (1814–1874) was a Swedish physicist and astronomer known for his significant contributions to the field of spectroscopy and the study of light. He is best recognized for his work in measuring the wavelengths of various spectral lines and for founding the science of spectrometry. Ångström is particularly noted for his studies of the spectrum of light emitted by different elements, which laid the groundwork for modern spectroscopy.