Agradecimentos: The authors thank S.N. Yurchenko (UCL) and Olga Naumenko for useful consultations and prof. Flávio C. Cruz (UNICAMP) for funding acquisition. Boris Voronin is grateful for the financial support of the grant - FAPESP (2022/08772-1). The work was partially supported by the MSHE RF (V.E. Zuev IAO SB RAS) Ver menos

Abstract: The absorption spectrum of (H2O)-O-19, a radioactive isotopologue of the water molecule, is predicted using variational nuclear motion calculated based on a high precision potential energy function and ab initio dipole moment surface. Vibrational - rotational energy levels and wave functions, line centers and Einstein coefficients for dipole transitions are calculated. Predicted transition wavenumbers are improved by extrapolating known empirical energy levels of the stable (H2O)-O-16, (H2O)-O-17 and (H2O)-O-18 isotopologues to (H2O)-O-19. A line list for possible atmospheric application is presented which includes air line broadening coefficients. The calculations span a wide spectral range covering infrared and visible wavelengths, and are appropriate for temperatures up to 1000 K. Windows suitable for observing absorption by (H2O)-O-19 are identified and comparisons made with the infrared spectra of water vapor in natural abundance, (H2O)-O-15 and (H2O)-O-14 Ver menos