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hydrogen spectal series



One of my former students asked for assistance with the following
letter. If anyone can offer some help, let me know.

Thank you

At the University, the reference librarians and I are having trouble finding the names
of the spectral series of atomic hydrogen for levels higher than six:

(lower level) (name)

1 Lyman
2 Balmer
3 Paschen
4 Brackett
5 Pfund
6 Humphreys

Do you know or have an idea of where to find out the names of the higher series? Do
you think these names even exist? I have found the year of "discovery" (first
observation) of the respective series for levels 1 through 5. Do you have a book >which lists the year Humphreys made his discovery?

I looked through the CRC Handbook of Chemistry and Physics and several other reference
books on spectroscopy, but none listed higher levels, and only one listed Humphreys.