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Terahertz spectroscopy of N$^{18}$O and isotopic invariant fit of several nitric oxide isotopologs

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arxiv 1412.4974 v1 pith:44K73LEO submitted 2014-12-16 astro-ph.GA astro-ph.EPastro-ph.IMphysics.atm-clus

Holger S. P. Müller , Kaori Kobayashi , Kazumasa Takahashi , Kazuko Tomaru , Fusakazu Matsushima This is my paper · ORCID
classification astro-ph.GAastro-ph.EPastro-ph.IMphysics.atm-clus
keywords rotationaldatawerenitricoxidedipoleinvariantisotopic
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abstract

A tunable far-infrared laser sideband spectrometer was used to investigate a nitric oxide sample enriched in 18O between 0.99 and 4.75 THz. Regular, electric dipole transitions were recorded between 0.99 and 2.52 THz, while magnetic dipole transitions between the 2Pi(1/2) and 2Pi(3/2) spin-ladders were recorded between 3.71 and 4.75 THz. These data were combined with lower frequency data of N(18)$O (unlabeled atoms refer to (14)N and (16)O, respectively), with rotational data of NO, (15)NO, N(17)O, and (15)N(18)O, and with heterodyne infrared data of NO to be subjected to one isotopic invariant fit. Rotational, fine and hyperfine structure parameters were determined along with vibrational, rotational, and Born-Oppenheimer breakdown corrections. The resulting spectroscopic parameters permit prediction of rotational spectra suitable for the identification of various nitric oxide isotopologs especially in the interstellar medium by means of rotational spectroscopy.

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  1. Submillimeter-wave spectroscopy of the CH$_3$O radical

    astro-ph.GA 2024-12 conditional novelty 6.0 of 10

    New submillimeter measurements of CH3O up to 860 GHz improve the fitted rotational constants and enable more reliable spectral prediction for interstellar detection.

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