Measurements of 14NH3 in the ν2=1 state by a solid-state, photomixing, THz spectrometer, and a simultaneous analysis of the microwave, terahertz, and infrared transitions between the ground and ν2 inversion-rotation levels

被引:42
作者
Chen, P
Pearson, JC
Pickett, HM
Matsuura, S
Blake, GA
机构
[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[2] CALTECH, Div Chem & Chem Engn, Pasadena, CA 91125 USA
[3] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Kanagawa 2298510, Japan
[4] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
基金
美国国家航空航天局;
关键词
NH3; ammonia; far-infrared; submillimeter; global fit; optical heterodyne; frequency; calibration; cavity; etalon; laser locking; metrology;
D O I
10.1016/j.jms.2006.01.002
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
In this paper, we report 30 THz measurements of ammonia in its excited, nu(2) = 1, inversion state. These measurements include transition frequencies and pressure shifts (where significant enough to be observed). Included in the data are two forbidden and three ro-inversion transitions, as well as 18 transitions never directly measured before. The measurements were made with an all-solid-state, diodelaser, difference-frequency spectrometer. Using an innovative laser-frequency locking scheme, this spectrometer provided accurately determined and continuously tuned THz-frequencies without requiring accurate knowledge of the absolute laser frequencies. The details of the spectrometer's frequency calibration is discussed. A global analysis of NH3 based on the available ground state, nu(2)=1 state, and nu(2)-band transitions was carried out, and the resulting set of recommended molecular effective-Hamiltonian parameters for ammonia is presented. In addition, calculated center frequencies and intensities for all possible transitions up to J = 20 between rotation, inversion, and vibration levels in the ground and nu(2)=1 states are included as supplementary material. (C) 2006 Elsevier Inc. All rights reserved.
引用
收藏
页码:116 / 126
页数:11
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