Dictionary of Gems and Gemology

2009 Edition
| Editors: Mohsen Manutchehr-Danai

A

Reference work entry
DOI: https://doi.org/10.1007/978-3-540-72816-0_2

the first line of Fraunhofer lines, in the deep red of the solar spectrum. Its wavelength is 760.60 nm; it is caused by oxygen in the earth’s atmosphere.

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© Springer-Verlag Berlin Heidelberg New York 2009