The absorption spectrum of short-lived isotopic variant of water, H215O: Tentative detection at the Earth's atmosphere. (December 2021)

• Record Type: Journal Article
• Authors: Voronin, B.A.; Makarova, M.V.; Poberovskii, A.V.; Bykov, A.D.; Dudnikova, E.A.; Tennyson, J.
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 276(2021)
• Publication Date: 2021-12
• Subjects: H215O -- Spectrum -- Line list -- Water vapor -- Atmospheric FTIR spectra; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2021.107929
• Languages: English
• ISSNs: 0022-4073

Abstract

Highlights: A room temperature vibration-rotation spectrum in calculated for H2 (15)O. A decade of FTIR spectra recorded in thunderstorms are analyzed for the signature of H2 (15)O. A line at 1973.5228 cm -1 is tentatively assigned to the (010) [752] – (000) [752] transition of H2 (15)O. Abstract: A calculated infrared vibration–rotation spectrum of isotopically modified water, H2 15 O, is presented. Oxygen-15 has a half-life of about 2 minutes and H2 15 O may be formed in the atmosphere during thunderstorms as a result of photonuclear processes or when the atmosphere is irradiated by cosmic γ-rays. Variational nuclear motion calculations of vibrational and vibrational-rotational levels up to 25000 cm −1 and up to J = 10 in angular momentum are performed within the framework of the Born-Oppenheimer approximation using an accurate water potential function. The line shape parameters for H2 15 O are estimated. Spectral ranges that are promising for the detection of H2 15 O in the atmosphere are identified and a search for spectral signatures conducted. A spectral feature is tentatively assigned to the 752 (0 1 0) - 643 (0 0 0) line of H2 15 O.