Absolute frequency list of the v(3)-band transitions of methane at a relative uncertainty level of 10(-11)

作者：Okubo Sho^*; Nakayama Hirotaka; Iwakuni Kana; Inaba Hajime; Sasada Hiroyuki

来源：Optics Express, 2011, 19(24): 23878-23888.

DOI：10.1364/OE.19.023878

We determine the absolute frequencies of 56 rotation-vibration transitions of the v(3) band of CH4 from 88.2 to 90.5 THz with a typical uncertainty of 2 kHz corresponding to a relative uncertainty of 2.2 x 10(-11) over an average time of a few hundred seconds. Saturated absorption lines are observed using a difference-frequency-generation source and a cavity-enhanced absorption cell, and the transition frequencies are measured with a fiber-laser-based optical frequency comb referenced to a rubidium atomic clock linked to the international atomic time. The determined value of the P(7) F-2((2)) line is consistent with the International Committee for Weights and Measures recommendation within the uncertainty.

• 出版日期2011-11-21