H 216O line strengths revisited: ν2 and 2 ν2– ν2 at 6 μm

Abstract

The necessity to revisit water spectroscopy at 6 μm was prompted by recent work indicating that some prior measurements of H 2 16O line strengths (ranging through seven orders of magnitude) had larger than expected systematic errors for the stronger transitions. To investigate this, linestrengths of stronger transitions were re-measured (with 14 new H 2O spectra recorded with a Bruker 125 HR Fourier transform spectrometer at the Jet Propulsion Laboratory) and combined with re-analyzed prior results (obtained at higher optical densities from 32 spectra recorded with the FTS at Kitt Peak). Systematic differences for some of the older data sets were identified and corrected. In this paper, an internally-consistent sampling of 1243 selected line strengths are reported for (0 1 0)–(0 0 0) and (0 2 0)–(0 1 0) transitions between 783 and 2378 cm −1. To confirm experimental precisions, observed and calculated line strengths are compared.