Universität zu Köln

Yu, Shanshan ORCID: 0000-0002-2472-7998, Pearson, John C., Drouin, Brian J., Sung, Keeyoon ORCID: 0000-0002-8030-7410, Pirali, Olivier, Vervloet, Michel, Martin-Drumel, Marie-Aline ORCID: 0000-0002-5460-4294, Endres, Christian P., Shiraishi, Tetsuro, Kobayashi, Kaori and Matsushima, Fusakazu (2010). Submillimeter-wave and far-infrared spectroscopy of high-J transitions of the ground and nu(2)=1 states of ammonia. J. Chem. Phys., 133 (17). MELVILLE: AMER INST PHYSICS. ISSN 1089-7690

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Abstract

Complete and reliable knowledge of the ammonia spectrum is needed to enable the analysis and interpretation of astrophysical and planetary observations. Ammonia has been observed in the interstellar medium up to J = 18 and more highly excited transitions are expected to appear in hot exoplanets and brown dwarfs. As a result, there is considerable interest in observing and assigning the high J (rovibrational) spectrum. In this work, numerous spectroscopic techniques were employed to study its high J transitions in the ground and nu(2) = 1 states. Measurements were carried out using a frequency multiplied submillimeter spectrometer at Jet Propulsion Laboratory (JPL), a tunable far-infrared spectrometer at University of Toyama, and a high-resolution Bruker IFS 125 Fourier transform spectrometer (FTS) at Synchrotron SOLEIL. Highly excited ammonia was created with a radiofrequency discharge and a dc discharge, which allowed assignments of transitions with J up to 35. One hundred and seventy seven ground state and nu(2) = 1 inversion transitions were observed with microwave accuracy in the 0.3-4.7 THz region. Of these, 125 were observed for the first time, including 26 Delta K = 3 transitions. Over 2000 far-infrared transitions were assigned to the ground state and nu(2) = 1 inversion bands as well as the nu(2) fundamental band. Of these, 1912 were assigned using the FTS data for the first time, including 222 Delta K = 3 transitions. The accuracy of these measurements has been estimated to be 0.0003-0.0006 cm(-1). A reduced root mean square error of 0.9 was obtained for a global fit of the ground and nu(2) = 1 states, which includes the lines assigned in this work and all previously available microwave, terahertz, far-infrared, and mid-infrared data. The new measurements and predictions reported here will support the analyses of astronomical observations by high-resolution spectroscopy telescopes such as Herschel, SOFIA, and ALMA. The comprehensive experimental rovibrational energy levels reported here will permit further refinement of the potential energy surface to improve ammonia ab initio calculations and facilitate assignment of new high-resolution spectra of hot ammonia. (C) 2010 American Institute of Physics. [doi:10.1063/1.3499911]

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Yu, Shanshan UNSPECIFIED orcid.org/0000-0002-2472-7998 UNSPECIFIED Pearson, John C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Drouin, Brian J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sung, Keeyoon UNSPECIFIED orcid.org/0000-0002-8030-7410 UNSPECIFIED Pirali, Olivier UNSPECIFIED UNSPECIFIED UNSPECIFIED Vervloet, Michel UNSPECIFIED UNSPECIFIED UNSPECIFIED Martin-Drumel, Marie-Aline UNSPECIFIED orcid.org/0000-0002-5460-4294 UNSPECIFIED Endres, Christian P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Shiraishi, Tetsuro UNSPECIFIED UNSPECIFIED UNSPECIFIED Kobayashi, Kaori UNSPECIFIED UNSPECIFIED UNSPECIFIED Matsushima, Fusakazu UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-492640
DOI:	10.1063/1.3499911
Journal or Publication Title:	J. Chem. Phys.
Volume:	133
Number:	17
Date:	2010
Publisher:	AMER INST PHYSICS
Place of Publication:	MELVILLE
ISSN:	1089-7690
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MICROWAVE 2-PHOTON SPECTROSCOPY; LASER HETERODYNE MEASUREMENTS; INVERSION-ROTATION SPECTRA; HYPERFINE-STRUCTURE; ABSORPTION-SPECTRA; STARK SPECTROSCOPY; VIBRATIONAL SYSTEM; LINE PARAMETERS; SUB-DOPPLER; NU-2 BAND Multiple languages Chemistry, Physical; Physics, Atomic, Molecular & Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/49264