The Journal covers the entire field of infrared physics and technology: theory, experiment, devices and instrumentation. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring. A fuller though not exhaustive list of topics would include: • Astronomy, Astrophysics and Space Research • Atmospheric transmission, turbulence and scattering. • Environmental applications: pollution and monitoring. • Detectors: quantum and thermal • Industrial applications • Infrared lasers including free electron lasers • Material properties, processing and characterization. • Medical applications • Nondestructive testing, active and passive. • Optical elements: lenses, polarizers, filters, mirrors, fibres, etc. • Radiometry: techniques, calibration, standards and instrumentation. • Remote sensing and range-finding • Solid-state physics • Thermal imaging: device design, testing and applications • Synchroton radiation in the infrared
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Measurements of water vapor continuum absorption in the 3.5-4.0-gm region are presented. The measurements were made with both long-path absorption cell and spectrophone systems. A deuterium fluoride grating tunable laser was the ir source. Measurements were made at 231C and 65 C with 14.3 Torr and 65 Torr of water vapor, respectively, buffered to 760-Torr total pressure by an 80/20 mixture of N2 /0 2. Both natural water and a special sample of deuterium depleted water (one-fiftieth the normal concentration) were used. The 65°C results agree with previous measurements by other workers. The 23°C results indicate a continuum absorption at this temperature about a factor of 2 larger than expected based on the extrapolation scheme and high-temperature data (265°C) of others.
