Müller HS, Klein H, Belov SP, Winnewisser G, Morino I, Yamada KM, Saito S
Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, Cologne, D-50937, Germany
J Mol Spectrosc. 1999 May;195(1):177-184. doi: 10.1006/jmsp.1999.7820.
The rotational spectrum of the NH2 radical in its &Xtilde;2B1 ground vibronic state was investigated between 614 and 1003 GHz. One hundred fifty-nine newly observed lines (188 hyperfine components) of six rotational transitions with 0 </= N </= 5 and 0 </= Ka </= 4 were used in the final, global fit of field-free data for the (000) vibrational state. Recent results from Fourier transform far-infrared (FT-FIR), and millimeter- and submillimeter-wave spectroscopy, as well as microwave optical double resonance (MODR) and recent FIR laser sideband data, were also used in the fit. A large set of spectroscopic constants reproduces the input data within experimental uncertainties and permits the precise prediction of low-N, low-Ka transitions of interest for the astrophysical community. In particular, the astrophysically important 111-000 transition of ortho NH2 was observed near 952.57 and 959.50 GHz. Copyright 1999 Academic Press.
在614至1003吉赫兹之间研究了处于其(\widetilde{X}^2B_1)基振转态的NH₂自由基的转动光谱。在（000）振动态的无场数据的最终全局拟合中，使用了159条新观测到的谱线（188个超精细成分），这些谱线属于0 ≤ N ≤ 5且0 ≤ Ka ≤ 4的六个转动跃迁。拟合中还使用了傅里叶变换远红外（FT - FIR）、毫米波和亚毫米波光谱学的最新结果，以及微波光双共振（MODR）和最新的FIR激光边带数据。一大组光谱常数在实验不确定度范围内重现了输入数据，并允许精确预测天体物理学界感兴趣的低N、低Ka跃迁。特别是，在952.57和959.50吉赫兹附近观测到了天体物理学上重要的邻位NH₂的111 - 000跃迁。版权所有1999年学术出版社。
