Paschen series


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Paschen series

(pä`shən): see spectrumspectrum,
arrangement or display of light or other form of radiation separated according to wavelength, frequency, energy, or some other property. Beams of charged particles can be separated into a spectrum according to mass in a mass spectrometer (see mass spectrograph).
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Paschen series

(pash -ĕn) See hydrogen spectrum.

Paschen series

[′päsh·ən ‚sir·ēz]
(spectroscopy)
A series of lines in the infrared spectrum of atomic hydrogen whose wave numbers are given by RH [(1/9) - (1/ n 2)], where RH is the Rydberg constant for hydrogen, and n is any integer greater than 3.
References in periodicals archive ?
If one postulates that the excited hydrogen atom can hold its electron in any excited orbital [N.sub.2] > 2, [H.sup.**], then the remaining complement of hydrogen emission lines could be produced [H.sup.**] [right arrow] [H.sub.*] + hv (Balmer [N.sub.2] > 2 [right arrow] [N.sub.1] = 2, Paschen series [N.sub.2] > 3 [right arrow] [N.sub.1] = 3, and Brackett series [N.sub.2] > 4 [right arrow] [N.sub.1] = 4).
The hydrogen lines of the Balmer series, and, as Babcock has recently shown, of the Paschen series as well, are verystrongin the Sun, though the energyrequired to put an atom into condition to absorb these series is, respectively, 10.16 and 12.04 volts--higher than for anyother solar absorption lines.
In the chromosphere, it is possible to observe spectroscopic emission lines from atomic hydrogen corresponding to the Lyman ([n.sub.2] > 1 [right arrow] [n.sub.1] = 1 [42]), Balmer ([n.sub.2] > 2 [right arrow] [n.sub.1] = 2 [30]), and Paschen series ([n.sub.2] > 3 [right arrow] [n.sub.1] = 3 [43]).* Lyman emission lines involve relaxation back to the ground state and