Absorption of Submillimeter Radiation by Battlefield Gases. Part II
Technical rept. Jan-Oct 1979
SCIENCE APPLICATIONS INC ANN ARBOR MI OPTICAL SCIENCES DIV
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The purpose of this report is to investigate properties of the atmosphere likely present in a land battlefield encounter, and to point out the impact of these properties which might affect the use of submillimeter wavelength electro-optic devices. The meaning of the term submillimeter should imply wavelength shorter than 1 mm. However, historically the term has included spectroscopic region between coherent microwave sources, and thermal infrared sources. The frequency range contains an area of black magic materials e.g. polyethylene windows, wire gratings, Rheststrahlen crystal filters, etc. For atmospheric sciences, the submillimeter is the region with wavelength beyond the 15 micron CO2 vibration band. For spectroscopy, the region is studied with very large coarsely ruled diffraction gratings at the infrared side, and very high harmonics of crystal oscillators on the microwave side. The absorption by molecules in this region is almost completely due to transitions between rotational energy levels with no change in vibrational state.
- Atomic and Molecular Physics and Spectroscopy
- Radiofrequency Wave Propagation