Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Lyman Series Wavelengths - measurement standard?

  1. May 15, 2015 #1
    Am just wondering what the currently accepted measurement standard is for the Lyman series spectral lines.

    At NIST I find the following set of measured wavelengths (nano meters):

    91.9342
    92.0947
    92.3148
    92.6249
    93.0751
    93.7814
    94.9742
    97.2517
    102.5728
    121.56701

    At http://www.trinitas.ru/rus/doc/0016/001b/00161313.htm I find another set of measured wavelengths:

    91.93514
    92.09631
    92.31504
    92.62257
    93.07483
    93.78035
    94.97431
    97.25368
    102.57223
    121.56701

    1. Which set of data is the currently accepted measurement standard ?

    2. Also the Russian site is using the value 1.0967878E+07 for the Rydberg constant and I would like to know where that comes from since it is neither the same as Codata 1.0973731569E+07 nor reduced mass corrected value of 1.0967758341E+07. The value they are using seems to calculate the second set of values to a very high level of precision without recourse to anything other than the standard Rydberg formula.

    3. Finally are the measured values from sun spectra or from some or other terrestrial light source ? Because at some level of accuracy one would presumably have to start accounting for gravitational redshift of solar spectra.
     
  2. jcsd
  3. May 20, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
     
  4. May 20, 2015 #3
    Hi Greg. Thanks for the 'courtesy bump' - no I haven't had any responses to this particular query. But I must confess to having somewhat 'bombarded' the Forums with questions on Lyman Alpha. See for eg this thread.

    https://www.physicsforums.com/threads/questions-on-the-lyman-alpha-profile.811283/
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Lyman Series Wavelengths - measurement standard?
  1. Space standards (Replies: 2)

  2. Waves & wavelengths (Replies: 13)

Loading...