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Updated: Aug 3, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Terahertz Spectroscopy of the Amidogen Radical, NH2
1Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, Cologne, D-50937, Germany
Researchers precisely measured the rotational spectrum of the NH2 radical, providing crucial data for astrophysics. This study enhances our understanding of interstellar molecules and their spectral properties.
Area of Science:
- Molecular Spectroscopy
- Astrophysical Chemistry
Background:
- The NH2 radical is a key molecule in interstellar chemistry.
- Understanding its rotational spectrum is vital for interpreting astronomical observations.
Purpose of the Study:
- To investigate the rotational spectrum of the NH2 radical in its ground vibronic state.
- To provide precise spectroscopic constants for astrophysical applications.
Main Methods:
- High-resolution rotational spectroscopy (614–1003 GHz).
- Global fitting of newly observed lines and hyperfine components.
- Incorporation of data from FT-FIR, millimeter-wave, submillimeter-wave, MODR, and FIR laser sideband spectroscopy.
Main Results:
- 159 new lines and 188 hyperfine components were assigned for six rotational transitions.
- A comprehensive set of spectroscopic constants was determined for the (000) vibrational state.
- The astrophysically significant 111-000 transition of ortho NH2 was observed.
Conclusions:
- The determined spectroscopic constants accurately reproduce experimental data.
- Precise predictions of low-N, low-Ka transitions are now possible.
- This work aids in the identification and characterization of NH2 in astrophysical environments.
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