Related Searches
Definitions

spectral-series

Hydrogen spectral series

In physics, the spectral lines of hydrogen correspond to particular jumps of the electron between energy levels. The simplest model of the hydrogen atom is given by the Bohr model. When an electron jumps from a higher energy to a lower, a photon of a specific wavelength is emitted according to the Rydberg formula:

{1 over lambda} = R left({1 over (n')^2} - {1 over n^2} right) qquad left(R = 10.972 times 10^6 mbox{m}^{-1} right)
where n is the initial energy level and n' is the final energy level, and R is the Rydberg constant.

The spectral lines are grouped into series according to n' :

  
     
     
     
     
     
     
     

n'

Series name

  

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

  
     
     
     
     
     
     
     
     

Lyman series

Balmer series

  

n

λ (nm)

n

λ (nm)

  

21223656
  
31034486
  
497.25434
  
594.96410
  
693.77397
  
infty91.1infty365

  
     
     
     
     
     
     
     
     

Paschen series

Brackett series

  

n

λ (nm)

n

λ (nm)

  

4187054050
  
5128062630
  
6109072170
  
7100081940
  
895491820
  
infty820infty1460

  
     
     
     
     
     
     
     
     

Pfund series

Humphreys series

  

n

λ (nm)

n

λ (nm)

  

67460712372
  
7465087503
  
83740105129
  
93300114673
  
103040134171
  
infty2280infty3282

Extension

Hydrogen is the element with the simplest-to-analyze emission spectrum. All other atoms possess at least two electrons in their unionized form and the interactions between these electrons makes analysis of the spectrum by such simple methods as described here impractical. The deduction of the Rydberg formula was a major step in physics, but it was long before an extension to the spectra of other elements could be accomplished.

See also

Search another word or see spectral-serieson Dictionary | Thesaurus |Spanish
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature
FAVORITES
RECENT

;