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Meaning of Pickering series | Babel Free

Noun CEFR B2

Definitions

Three lines of singly ionized helium found, usually in absorption, in the spectra of hot stars, produced by transitions of an electron with principal quantum number n=4 state from a higher energy level.

CEFR level

B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
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See also

pickeringite Pickers Pickersgill pickery Picket picket boat

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