Terahertz Spectroscopy of the Amidogen Radical, NH₂

Author： Müller H.S.P. Klein H. Belov S.P. Winnewisser G. Morino I. Yamada K.M.T. Saito S.

ISSN： 0022-2852

Source： Journal of Molecular Spectroscopy, Vol.195, Iss.1, 1999-05, pp. : 177-184

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Abstract

The rotational spectrum of the NH₂ radical in its X~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 ≤ K_a ≤ 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-K_a 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.