Analysis of line positions and strengths of H_2 ~(16)O ground and hot bands connecting to interacting upper states: (020), (100), and (001)

摘要

High-resolution spectra of H_2 ~(16)O were recorded with a Fourier-transform spectrometer covering transitions in the (020)-(010), (100)-(010), and (001)-(010) bands from 1100 to over 2300 cm~(-1). Also included in the study were previously reported measurements of these bands and measurements of the (020)-(000), (100)-(000), and (001)-(000) bands from 2620 cm~(-1) to 4500 cm~(-1). The linestrengths were fitted to a model which takes into account the interactions between the vibrational states (020), (100), and (001). The model included dipole moment matrix elements (also referred to as transition elements) represented by 19 expansion coefficients for B-type transitions and 14 expansion coefficients for A-type band transitions. The most satisfactory results were obtained when the relative signs and values of the leading dipole moment terms of each of the three 'hot' bands were as follows: u(020-010) = 1.936(97) × 10~(-1) D, u(100-010) = 3.876(19) × 10~(-2) D, and u(001-010) = 2.523(75) × 10~(-2) D. Hot water emission experimental frequencies from other studies were included in an analysis to obtain rotational energies for levels up to high J and/or K_a of the (020), (100), and (001) vibrational states. The results from this study provide a more accurate representation of the parameters than those available at present for the six bands.