Medium Resolution Transmission Measurements of Water Vapor at High Temperature

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.