Expert Assessment of the Accuracy of Determining the Intensities of Vibrational-rotational Lines of Water Vapor in the HITRAN Database in the Range 2500–6500 cm^–1

An expert assessment of the accuracy codes for the intensities of rovibrational transitions of water vapor in the spectral range 2500–6500 cm^–1 of the HITRAN2020 database has been carried out. From comparison with experimental data, the normalization coefficients of the variational calculation by Conway E.K., Gordon I.E., Kyuberis A.A., Polyansky O.L., Tennyson J., Zobov N.F. // J. Quant. Spectrosc. Radiat. Transfer. 2020. V. 241. P. 106711 were determined; for the absorption bands (001)–(000), (020)–(000), (011)–(000), and (110)–(000), they were 1.010, 1.007, 1.013, and 1.030, respectively. Using variational calculations and modeling based on the effective Hamiltonian approach, the analysis of experimental data from the HITRAN2020 database has been carried out, revealing less accurate values. Based on these results, an adjusted list of H₂¹⁶O absorption lines in the range 2500–6500 cm^–1 has been constructed, which can be useful for natural experiments.