What is Pfund series of the hydrogen spectrum?

The electron transitions from n ≥6 to n=5 result in the emergence of a sequence of spectral lines in the Pfund series of the hydrogen spectrum. Consequently, the n1 and n2 values of the Brackett series vary from 5 to infinity.

1. Pfund series

This series of spectral lines were
observed during electron transition
from higher stationary orbits to the
fifth orbit of the hydrogen atom
It is named after the discoverer
August Herman Pfund. And it occurs
in the far infrared region of the
electromagnetic spectrum.
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