✍ Scribed by Z. Zelinger; T. Amano; V. Ahrens; S. Brünken; F. Lewen; H.S.P. Müller; G. Winnewisser
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Measurements of the rotational spectrum of HCN in excited vibrational states have been extended to higher-J values. The transitions reach J ¼ 8 7 around 710 GHz for most vibrational states studied in this investigation and J ¼ 22 21 near 2 THz for the (020) and ( 030) vibrational states. Using a pure sample of gaseous HCN at $350 K, selected states up to one quantum in the C-H stretching vibration at 3311:5 cm À1 have been investigated. Even transitions having two quanta in the C-H stretch could be studied employing a glow discharge in a gas mixture of CH 4 and N 2 . Molecular constants in 13 vibrational states have been obtained, several of which have been studied for the first time by rotational spectroscopy. The vibrational temperature in the discharge system is found to be about 1500 K for the stretching vibrational modes and about 600 K for the bending states.
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The rotational spectra of the unstable HCCCP molecule have been investigated in the millimeter-wave region for the main excited vibrational states which lie below 1000 cm Ϫ1 , namely 4 (COC stretch), 5 (HCC bend), 6 (CCC bend), 7 (CCP bend), 2 6 , 2 7 , 3 7 , 4 7 , 5 ϩ 7 , and 6 ϩ 7 . l-type resonan
The submillimeter-wave rotational transitions of HOC ϩ in the 2 excited state are first detected using the double-modulation method, and the precise transition frequencies and the much improved molecular constants are obtained. The measurements of the ground state HOC ϩ and DOC ϩ submillimeter-wave
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