Frequency measurements of the 2ν3A1-ν3 band transitions of methane in comb-referenced infrared-infrared double-resonance spectroscopy

被引：3
|
作者：
Okubo, Sho [1 ]
Inaba, Hajime [1 ]
Okuda, Shoko [2 ]
Sasada, Hiroyuki [1 ,2 ]
机构：
[1] Natl Inst Adv Ind Sci & Technol, Natl Metrol Inst Japan NMIJ, Tsukuba, Ibaraki 3058563, Japan
[2] Keio Univ, Fac Sci & Technol, Dept Phys, Yokohama, Kanagawa 2238522, Japan
来源：
PHYSICAL REVIEW A | 2021年 / 103卷 / 02期
基金：
日本科学技术振兴机构;
关键词：
42;
D O I：
10.1103/PhysRevA.103.022809
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We carry out infrared-infrared double-resonance spectroscopy of the 2 nu(3)A(1)-nu(3) band of methane. Ten transitions of Q(1) to Q(4) are observed with an 88.5-THz difference-frequency-generation (DFG) source, while the lower levels are pumped through the nu(3) band transition by another 90.5-THz DFG source phase-locked to an optical frequency comb (OFC). The transition frequencies are determined using the OFC with an uncertainty of 10 kHz, which is an improvement of 4 orders of magnitude compared with the previous studies.
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页数：7
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