Abstract
The rotational spectra of the NH 3 –D 2 and ND 3 –H 2 van der Waals complexes have been observed in a supersonic molecular jet for the first time. The OROTRON intracavity spectrometer was used to detect pure rotational transitions in the frequency range from 75 to 120 GHz. The search of the spectral lines was based on the initial observation of the main isotopic species of the NH3−H2. The measured transition frequencies including hyperfine splitting were analyzed in order to determine the energy levels, molecular parameters and structure of the ortho ND 3 − ortho H 2 and ortho NH 3 − para D 2 complexes.
Highlights
The rotational spectra of the ND3−H2 and NH3−D2 van der Waals complexes have been observed in a supersonic molecular jet for the first time
Since its discovery in the interstellar medium in 1969, ammonia has been widely used as a probe of the physical conditions in a variety of interstellar environments, ranging from prestellar cores, molecular clouds, to external galaxies
The calibration of this ammonia thermometer depends on the accuracy of the collisional rates with H2
Summary
The rotational spectra of the ND3−H2 and NH3−D2 van der Waals complexes have been observed in a supersonic molecular jet for the first time. Since its discovery in the interstellar medium in 1969, ammonia has been widely used as a probe of the physical conditions in a variety of interstellar environments, ranging from prestellar cores, molecular clouds, to external galaxies. The peculiar structure of the molecule makes ammonia lines excellent tracers of the density and temperature in these environments.
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