The pair 3² P j →²S1/2 (thats 3, superscript 2, P subscript J, and superscript 2, S, subscript 1/2) transitions in atomic sodium are called the DI and DII transitions.
The pair 3² P j →²S1/2 (thats 3, superscript 2, P subscript J, and
superscript 2, S, subscript 1/2) transitions in atomic sodium are called the DI and DII transitions. They are among the most prominent absorption features of the solar spectrum. There is a transition in Helium very close to the Na transitions that was originally called the DIII line. Use the NIST tables to identify the levels involved in this He transition.
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