Laboratory submillimeter-wave observation of the N = 1-0 transition of the ND(3Sigma-) radical

Details Laboratory submillimeter-wave observation of the N = 1-0 transition of the ND(3Sigma-) radical Laboratory submillimeter-wave observation of the N = 1-0 transition of the ND(3Sigma-) radical

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...410l..53s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 410, no. 1, p. L53-L55.

Astronomy and Astrophysics

Astrophysics

53

Deuterium Compounds, Molecular Energy Levels, Nitrogen Compounds, Submillimeter Waves, Fine Structure, Ground State, Hamiltonian Functions, Hyperfine Structure, Microwave Spectrometers, Spin-Spin Coupling, Vibrational Spectra

Scientific paper

Three fine-structure components of the N = 1-0 rotational transition of the ND radical in its ground vibronic (X 3Sigma-) state were observed by laboratory submillimeter-wave spectroscopy using a source-modulated system combined with a hollow cathode free-space cell. The ND radical was generated by a dc glow-discharge in pure ND3 gas. Six hyperfine resolved components were observed for N, J = 1, 0-0, 1 transition at 492 GHz, 22 components for N, J = 1, 2-0, 1 at 522 GHz, and 12 components for N, J = 1, 1-0, 1 at 546 GHz. The molecular constants, including the rotational constant, the spin-spin coupling constant with its centrifugal distortion term, and the hyperfine coupling constants associated with the nitrogen and deuterium nuclei were precisely determined by least-squares fitting to the observed spectral lines. The precise line frequency determined by laboratory spectroscopy should be useful for future astronomical searches.

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