Brackett series
(hydrogen lines for electrons settling from n > 4 to n = 4)
The Brackett series is the set of
emission lines from atomic hydrogen gas,
due to electrons descending from
an electron shell of number n greater than 4 down to that of n = 4,
or the analogous absorption lines when absorbed electromagnetic radiation (EMR)
makes electrons do the opposite.
It is one of the hydrogen line series, such as
the Lyman series and Balmer series, and is
named after Frederick Sumner Brackett.
The lines are within infrared and some are within atmospheric windows,
so given no redshift, some of the lines in astronomical sources may
be viewed from ground telescopes while others are blocked.
Lines:
- 5 -> 4: 4051 nm
- 6 -> 4: 2625 nm
- 7 -> 4: 2166 nm
- 8 -> 4: 1944 nm
- 9 -> 4: 1817 nm
- ...
- infinity -> 4: 1458 nm
Formula for the wavelengths:
1/wavelength = RH ( 1/16 - 1/n² )
(Brackett,hydrogen,line series,lines,spectrum)
Further reading:
https://en.wikipedia.org/wiki/Hydrogen_spectral_series
http://dept.harpercollege.edu/chemistry/chm/100/dgodambe/thedisk/spec/5back5.htm
http://hyperphysics.phy-astr.gsu.edu/hbase/Tables/hydspec.html
https://www.nist.gov/system/files/documents/srd/jpcrd382009565p.pdf
WaveL | Freq | Photon Energy | | |
1458nm | 206THz | 850meV | begin | Brackett series |
4050nm | 74THz | 306meV | end | Brackett series |
|
Referenced by pages:
hydrogen (H)
spectral line
Index