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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Infrared absorption by the water vapor continuum near 1200 cm-1 has been measured with a lead-tin-telluride diode laser over a 40.5-m optical path. The measurements were made as a function of temperature from 333 K to 473 K; thus, they overlap and extend previous measurements made at temperatures between 293 K and 388 K. Over the entire temperature range studied here, the continuum extinction coefficient increases quadratically with water-vapor partial pressure as expected for the relatively high partial pressures used in these measurements. At temperatures below 398 K. our measured extinction coefficients agree well with previously reported data. At higher temperatures, however, the extinction coefficient is almost independent of temperature and is substantially larger than predicted by empirical formulas. Values of the self-broadening coefficient for water vapor have been extracted from the experimental data, and a possible interpretation of the results involving both dimer and line-broadening effects is presented.
