Il Nuovo Cimento (1955-1965)

, Volume 25, Issue 1, pp 48–54 | Cite as

The absence of circular dichroism in16O2 and a resultant upper limit for parity nonconservation

  • L. C. Bradley
  • N. S. Wall


By a study to determine the preferential absorption of one component of circularly polarized light in a molecular magnetic dipole transition in16O2 we have determined an upper limit to the parity impurity of the states involved in the transition. We find the amplitude of the PNC part of the states are less than or equal to 3·10−8 from a measurement of the circular polarization that is less than or equal to 6·10−4.


Con uno studio per determinare l’assorbimento preferenziale di una componente della luce polarizzata circolarmente in una transizione molecolare di dipolo magnetico nel16O2, abbiamo stabilito un limite superiore alla impurezza della parità degli stati coinvolti nella transizione. Troviamo che le ampiezze della parte PNC degli stati sono minori od uguali a 3·10−8 in base a misure della polarizzazione circolare che è minore od uguale a 6·10−4.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. (1).
    T. D. Lee andC. N. Yang:Phys. Rev.,104, 254 (1956).ADSCrossRefGoogle Scholar
  2. (2).
    T. D. Lee, R. Oehme andC. N. Yang:Phys. Rev.,106, 340 (1957).MathSciNetADSCrossRefGoogle Scholar
  3. (3).
    R. J. Blin-Stoyle:Phys. Rev.,120, 181 (1960).MathSciNetADSCrossRefGoogle Scholar
  4. (4).
    M. Sachs:Ann. Phys.,6, 244 (1959);M. Sachs andS. L. Schwebel:Ann. Phys.,8, 475 (1959).MathSciNetADSCrossRefMATHGoogle Scholar
  5. (5a).
    Ya. B. Zel’dovich andA. M. Perelomov:Žurn. Ėksp. Teor. Fiz.,39, 1115 (1960);Google Scholar
  6. (5b).
    translation,Sov. Phys. JETP,12, 777 (1960).Google Scholar
  7. (6).
    W. E. Lamb jr. andR. C. Retherford:Phys. Rev.,79, 549 (1950). The effects discussed byZel’dovich andPerelomov (5) are still too small to affect the results of this experiment.ADSCrossRefGoogle Scholar
  8. (7).
    J. H. Van Vleck:Astrophys. Journ.,80, 161 (1934).ADSCrossRefMATHGoogle Scholar
  9. (8).
    W. H. J. Childs andR. Mecke:Zeits. Phys.,68, 344 (1931).ADSCrossRefGoogle Scholar
  10. (9).
    The wavelengths of the KrI and16O2 lines have been measured byC. J. Humphreys:Bur. Standards Journ. Res.,5, 1041 (1930), and byH. D. Babcock andL. Herzberg:Astrophys. Journ.,108, 167 (1948), respectively. The Zeeman-effect measurements in Kr are byJ. B. Green, D. W. Bowman andE. H. Hurlbut:Phys. Rev.,58, 1094 (1940).CrossRefGoogle Scholar
  11. (10).
    P. G. Wilkinson andR. S. Mulliken:Astrophys. Journ.,125, 594 (1957).ADSCrossRefGoogle Scholar
  12. (11).
    For example,D. E. Alburger, R. E. Pixley, D. H. Wilkinson andP. Donovan:Phil. Mag.,6, 171 (1961).ADSCrossRefGoogle Scholar

Copyright information

© Società Italiana di Fisica 1962

Authors and Affiliations

  • L. C. Bradley
    • 1
  • N. S. Wall
    • 2
    • 3
  1. 1.Research Laboratory of ElectronicsMassachusetts Institute of TechnologyCambridge
  2. 2.Institute for Theoretical PhysicsUniversity of CopenhagenCopenhagen
  3. 3.Laboratory for Nuclear ScienceMassachusetts Institute of TechnologyCambridge

Personalised recommendations