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

@article{Ahrens2002SubDopplerSS,
  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},
  year={2002},
  volume={57},
  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… 

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