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Ro-inversional Spectrum of Ammonia

机译:氨的Ro反转谱

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摘要

The ground state J = 2 ←1, K = 0 and K = 1 ro-inversional spectrum of ~(14)NH_3 and ~(15)NH_3 at 1.2 THz has been measured with an accuracy of 20 kHz using the Cologne terahertz spectrometer. The measured frequencies for the K = 0 components are: ~(14)NH_3 (J, K) = a(2, 0)-s(1, 0): 1 214 852.942(20) MHz, ~(15)NH_3 (J, K) = a(2, 0) - s(1, 0): 1 210 889.556(20) MHz. In addition we have determined from saturation dip measurements of the J = 1-0 transition the spin-rotation constant C_N = 6.7(3) kHz and the unsplit line center frequency: ~(14)NH_3 (J, K) = s(1, 0)-a(0, 0): 572 498.163(10) MHz. The new results are in excellent agreement with existing high resolution Fourier transform data. The terahertz line frequencies are of considerably higher accuracy than the FT-data, by about two orders of magnitude. They will serve as future calibration lines. The ro-inversional transitions are of astrophysical interest.
机译:使用科隆太赫兹光谱仪以20 kHz的精度测量了〜(14)NH_3和〜(15)NH_3在1.2 THz时的基态J = 2←1,K = 0和K = 1反转谱。 K = 0分量的测量频率为:〜(14)NH_3(J,K)= a(2,0)-s(1,0):1214852.942(20)MHz,〜(15)NH_3( J,K)= a(2,0)-s(1,0):1 210 889.556(20)MHz。另外,我们从饱和倾角测量值J = 1-0跃迁确定了自旋旋转常数C_N = 6.7(3)kHz和未裂线中心频率:〜(14)NH_3(J,K)= s(1 ,0)-a(0,0):572 498.163(10)MHz。新结果与现有的高分辨率傅立叶变换数据非常吻合。太赫兹线频率的精度比FT数据高出大约两个数量级。它们将用作将来的校准线。反向反转具有天体物理学意义。

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