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
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作者:
Chen, P
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机构:CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
Chen, P
Pearson, JC
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机构:CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
Pearson, JC
Pickett, HM
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机构:CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
Pickett, HM
Matsuura, S
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机构:CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
Matsuura, S
Blake, GA
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机构:CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
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
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.