Home
For authors
Submission status

Current
Archive
Archive (English)
   Volumes 21-40
   Volumes 1-20
   Volumes 41-62
      Volume 62
      Volume 61
      Volume 60
      Volume 59
      Volume 58
      Volume 57
      Volume 56
      Volume 55
      Volume 54
      Volume 53
      Volume 52
      Volume 51
      Volume 50
      Volume 49
      Volume 48
      Volume 47
      Volume 46
      Volume 45
      Volume 44
      Volume 43
      Volume 42
      Volume 41
Search
VOLUME 43 (1986) | ISSUE 4 | PAGE 167
Constancy of the fundamental constants
A time variation of the ratio of the frequencies of quantum standards for the optical and rf ranges has been observed experimentally. With respect to the frequency of the standard transition of the Cs atom, the frequencies of He-Ne/CH4 lasers stabilized on the basis of the F\ and Ε components of methane decreased by 4.7 ± 0.7 and 4.3 + 1.7 kHz, respectively, over an interval of 4 years, 8 months. The hypothesis of a time variation of the fundamental constants is discussed as a possible reason.