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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Water continuum CO2 laser absorption spectra are reported for temperatures between 27 and -10°C. The continuum is found to possess a negative temperature coefficient. The results obtained suggest that the magnitude of this temperature coefficient increases with increasing water pressure and decreasing temperature. The temperature coefficients between 27 and 10°C for air mixtures containing 3.0- and 7.5-Torr water vapor are -2.0 ± 0.4 and -2.9 d 0.5%/ C, respectively. For mixtures with 3.0-Torr water the 10-O°C temperature coefficient is -7.7 ± 0.2%/°C. The temperature and water pressure dependencies observed for the continuum suggest that while both collisional broadening and water dimer mechanisms contribute to the continuum, the dimer mechanism is more important over this temperature range.
