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.
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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