Hyperfine splitting of the 13CH4 line at 3.39 microm observed by laser-saturated absorption.
The hyperfine splitting and the recoil doubling of the F(2)((2)) component in the P(6) line of the v(3) band of (1)3CH(4) was resolved with a narrow linewidth of less than 1 kHz (HWHM). Positions of the hyperfine components were precisely determined and related to the absolute frequency frame.
Uehara
K
K
Joint Institute for Laboratory Astrophysics, National Bureau of Standards and University of Colorado, Boulder, Colorado 80309, USA.
Hall
J L
JL