Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...540l..61s&link_type=abstract
The Astrophysical Journal, Volume 540, Issue 1, pp. L61-L64.
Astronomy and Astrophysics
Astronomy
3
Stars: Circumstellar Matter, Ism: Molecules, Line: Identification, Methods: Laboratory, Molecular Data
Scientific paper
The MgNH2 radical has been detected in the laboratory for the first time in its X2A1 ground state using techniques of millimeter-wave spectroscopy. This short-lived species was created using Broida oven methods. Multiple Ka asymmetry components were recorded for MgNH2 in 12 rotational transitions in the frequency range 129-527 GHz, and spin-rotation splittings were resolved in every component. A total of 251 separate lines were measured. An intensive search for a possible inversion state in MgNH2 was also conducted but proved negative. This data set has been modeled with an S-reduced Hamiltonian and very accurate rotational, centrifugal distortion, and spin-rotation parameters have been determined for magnesium amide. This study strongly suggests that the radical is planar with C2v symmetry, although small barriers to planarity cannot be ruled out. MgNH2 could be produced in interstellar/circumstellar gas from the association reaction of Mg++NH3, as predicted by theory.
Sheridan Philip M.
Ziurys Lucy M.
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