Measurements of the absolute frequency of a He-Ne/CH4 laser
Bagaev S. N. , Klement'ev V. M. , Chebotaev V. P.
The results of absolute measurements of the methane transition frequency F£2) carried out in experiments separated by a time interval of 2 yr are reported. The difference between the F{22) and Ε transition frequencies of methane has also been measured.