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  1. Path: sparky!uunet!cis.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.INS.CWRU.Edu!agate!dog.ee.lbl.gov!csa2.lbl.gov!sichase
  2. From: sichase@csa2.lbl.gov (SCOTT I CHASE)
  3. Newsgroups: sci.physics
  4. Subject: Re: E=mc2?
  5. Date: 1 Sep 92 18:40:44 GMT
  6. Organization: Lawrence Berkeley Laboratory - Berkeley, CA, USA
  7. Lines: 19
  8. Distribution: na
  9. Message-ID: <25901@dog.ee.lbl.gov>
  10. References: <1992Aug31.041026.17766@nuscc.nus.sg> <17sacmINNd2s@darkstar.UCSC.EDU> <1992Aug31.094157.17751@u.washington.edu> <5258@dove.nist.gov>
  11. Reply-To: sichase@csa2.lbl.gov
  12. NNTP-Posting-Host: 128.3.254.197
  13. News-Software: VAX/VMS VNEWS 1.3-4   
  14.  
  15. In article <5258@dove.nist.gov>, gilligan@bldrdoc.gov (Jonathan Gilligan 303-497-3861) writes...
  16. > 
  17. >Of course, it's reasonably easy to measure the mass-difference in
  18. >nuclear reactions.  I don't know of any measurements of
  19. >mass-differences due to chemical reactions.
  20.  
  21. They're getting very close to being able to do this kind of thing in 
  22. atomic traps.  Using a Paul trap, I believe, at least one group has measured
  23. mass differences down to a few * 10 eV.   In the next few years a little
  24. improvement will allow the measurment of mass differences due to different
  25. electron configurations - weighing chemical bonds.
  26.  
  27. -Scott
  28. --------------------
  29. Scott I. Chase            "The question seems to be of such a character
  30. SICHASE@CSA2.LBL.GOV        that if I should come to life after my death
  31.                 and some mathematician were to tell me that it
  32.                 had been definitely settled, I think I would
  33.                 immediately drop dead again."      - Vandiver
  34.