Sub-Doppler Saturation Spectroscopy of HCN up to 1 THz and Detection of J = 3 —> 2 (4—> 3) Emission from TMC1

  title={Sub-Doppler Saturation Spectroscopy of HCN up to 1 THz and Detection of J = 3 —> 2 (4—> 3) Emission from TMC1},
  author={V. Ahrens and Frank Lewen and Shuro Takano and Gisbert F. Winnewisser and S̆tĕp{\'a}n Urban and A. A. Negirev and A. N. Koroliev},
  journal={Zeitschrift f{\"u}r Naturforschung A},
  pages={669 - 681}
Very high-resolution ( ∼ 30 kHz) and very precise (±2 kHz) saturation dip and crossover dip measurements are reported for HCN. Nine consecutive rotational transitions of the vibrational ground state were recorded, covering the rotational spectrum up to the J = 11 ← 10 transition at 975 GHz. Commencing the saturation dip measurements with the J = 3 ← 2 transition located at 265 886.4 MHz, all rotational transitions were measured up to J = 11 ← 10 (ΔF = 1), positioned at a center frequency of 974… 

Observation of a rotational transition of trapped and sympathetically cooled molecular ions

We demonstrate rotational excitation of molecular ions that are sympathetically cooled by laser-cooled atomic ions to a temperature as low as ca. 10 mK. The molecular hydrogen ions HD+ and the

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The line width of ions has been observed to be systematically narrower than that of the coexisting neutrals in molecular clouds and been interpreted as the signature of the decoupling of the neutral

Precise spectroscopy of astrophysically important species

  • A. Lapinov
  • Physics
    Symposium on High-Resolution Molecular Spectroscopy
  • 2006
Detailed studies of physical and chemical conditions in regions of star formation need multiline observations of different molecular species. A correct retrieval of systematic velocity fields in

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Electric and magnetic properties of the four most stable CHNO isomers from ab initio CCSD(T) studies.

Electric and magnetic properties obtained from CCSD(T)/(aug-)cc-pCVXZ (X = T, Q, or 5) electronic structure calculations are reported for isocyanic acid, HNCO, cyanic acid, HOCN, fulminic acid, HCNO,




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