单词	absorption line
释义	absorption line noun : a dark line in an absorption spectrum Example Sentences Recent Examples on the Web With an extra neutron in its nucleus, the deuterium absorption line overlaps with, but its peak is off-center from, the peak of the normal hydrogen. Ethan Siegel, Forbes, 6 Apr. 2021 After reanalyzing the data, Greaves said her team still finds an absorption line for phosphine, but at far lower levels of 1 part per billion (ppb). Paul Voosen, Science | AAAS, 17 Nov. 2020 Instead, proof could arrive in the form of very distinct spectroscopic features—particularly an absorption line at 450 nanometers within the visible portion of the electromagnetic spectrum. Shannon Hall, Scientific American, 12 June 2019 The most prominent absorption lines of hydrogen and ionized oxygen are at very short wavelengths, in the ultraviolet and X-ray portions of the spectrum. Quanta Magazine, 19 Sep. 2018 The precise shape of the absorption line also matches that seen in hydrogen, as the researchers report today in Nature. Adrian Cho, Science | AAAS, 4 Apr. 2018 Word History First Known Use 1861, in the meaning defined above
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