Sub-Doppler Resolution in the THz Frequency Domain: 1 kHz Accuracy at 1 THz by Exploiting the Lamb-Dip Technique
Sub-Doppler Resolution in the THz Frequency Domain: 1 kHz Accuracy at 1 THz by Exploiting the Lamb-Dip Technique
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DOI：
10.1021/jp407980f
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发表时间：
2013-12-19
影响因子：
2.9
通讯作者：
Puzzarini, Cristina
中科院分区：
文献类型：
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作者：
Cazzoli, Gabriele;Puzzarini, Cristina
我们报告的第一次彻底调查的羔羊浸效应在太赫兹区域，这反过来又允许子多普勒分辨率被利用在这个频率区域。证明了1 kHz或甚至更好（即，精度优于1/109），以及50 kHz的频率分辨率（即，分辨率优于5分之108）。它还表明，可以使用法布里-珀罗干涉仪单元或自由空间单元记录兰姆-浸渍光谱。硫化氢（H2S）、二氧化硫（SO2）、氘代水（D2 O）和甲基氟（CH 3F）已被选为示例，用于证明可达到的准确度和分辨率，从而为这些分子提供1.0-1.2 THz频率范围内最准确的频率值。SO2的测量也已采用在一个全球性的配合，从而提高其振动基态的光谱参数。
We report the first thorough investigation of the Lamb-dip effect in the THz region, which in turn allows sub-Doppler resolution to be exploited in this frequency region. It is demonstrated that an accuracy of 1 kHz, or even better (i.e., an accuracy better than 1 part in 109), and a frequency resolution of 50 kHz (i.e., a resolution better than 5 parts in 108) can be routinely obtained in our laboratory. It has also shown that Lamb-dip spectra can be recorded using either a Fabry-Perot interferometric cell or a free-space cell. Hydrogen sulfide (H2S), sulfur dioxide (SO2), deuterated water (D2O), and methyl fluoride (CH3F) have been selected as examples for demonstrating the accuracy and resolution reachable, thus providing the most accurate frequency values in the 1.0-1.2 THz frequency range for these molecules. Measurements for SO2 have also been employed in a global fit, thus improving its spectroscopic parameters for the vibrational ground state.