Universität zu Köln

Surin, L. A., Tarabukin, I. V., Schlemmer, S., Breier, A. A., Giesen, T. F., McCarthy, M. C. and van der Avoird, A. (2017). Rotational Spectroscopy of the NH3-H-2 Molecular Complex. Astrophys. J., 838 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We report the first high resolution spectroscopic study of the NH3-H-2 van der Waals molecular complex. Three different experimental techniques, a molecular beam Fourier transform microwave spectrometer, a millimeter-wave intracavity jet OROTRON spectrometer, and a submillimeter-wave jet spectrometer with multipass cell, were used to detect pure rotational transitions of NH3-H-2 in the wide frequency range from 39 to 230 GHz. Two nuclear spin species, (o)-NH3-(o)-H-2 and (p)-NH3-(o)-H-2, have been assigned as carriers of the observed lines on the basis of accompanying rovibrational calculations performed using the ab initio intermolecular potential energy surface (PES) of Maret et al. The experimental spectra were compared with the theoretical bound state results, thus providing a critical test of the quality of the NH3-H-2 PES, which is a key issue for reliable computations of the collisional excitation and de-excitation of ammonia in the dense interstellar medium.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Surin, L. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tarabukin, I. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Breier, A. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Giesen, T. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED McCarthy, M. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED van der Avoird, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-236477
DOI:	10.3847/1538-4357/aa615a
Journal or Publication Title:	Astrophys. J.
Volume:	838
Number:	1
Date:	2017
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language VAN-DER-WAALS; AB-INITIO CALCULATIONS; COLLISIONAL EXCITATION; AMMONIA; MICROWAVE; SPECTRUM; STATES; H-2; THERMOMETER; SCATTERING Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23647