Medium resolution transmissivities of water vapor were measured at temperatures between 600 K and 1550 K for all important vibration-rotation bands as well as part of the purely rotational band. Measurements were made with an improved drop tube design, which guarantees a truly isothermal high-temperature gas column. Data were collected with an FTIR-spectrometer, allowing for much better spectral resolution than most previous high-temperature measurements. The measured data were compared with the HITEMP database, as well as with the data of Phillips for the 2.7 μm band of H2O. The data show minor discrepancies with the high-resolution database, particularly at higher temperatures, but in general agreement is acceptable.

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