Humphreys series

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In atomic physics, the Humphreys series is the designation of one of a set of six different named series describing the spectral line emissions of the hydrogen atom, and was discovered by Curtis J. Humphreys in 1953. In the Humphreys series the spectrum of hydrogen reflects emissions of photons in the far infrared by electrons in excited states transitioning to the quantum level described by the principal quantum number n equals 6. It begins at 12368 nm and has been traced to 3281.4 nm.

n 7 8 9 10 11 12 13 14 15 16 17 \infty
Wavelength (nm) 12368 7503 5905 5129 4673 4374 4171 4021 3908 3819 3749 3281

Although this is the last series designated by a name, there are series for transitions from lines of the n-7, n-8, n-9, and n-10 series.

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Hydrogen spectral series