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Nova Engineering, Cincinnati OH, a division of L- 3 Communications (L- 3 Nova), under the sponsorship of Program Manager Soldier Warrior (PM-SWAR), Fort Belvoir, VA, has developed a Soldier portable, light-weight, hand-held, geolocation sensor and processing system called the Handheld Emissions Detector ( HED). Handheld emissions detector ( HED): overview and development copyright 1997 The American Physical Society The lowest J= 1 left-arrow 0 transition of 4 HeH + observed at 2010.1839( 2)GHz will be an important future probe for detecting this species in space. In particular, Δ parameters with k=0 and l= 1,2 were determined with unprecedented accuracy, and provide important information for breakdown of the Born-Oppenheimer approximation. Dunham coefficients Y kl and isotopically independent parameters U kl, Δ He kl, and Δ H kl were determined. Low J rotational transitions of 4 HeH +, 4 HeD +, 3 HeH +, and 3 HeD + were observed in the 2 endash 5THz region with a high-precision far-infrared spectrometer. Observation of the Rotational Spectra of 4HeH+, 4 HeD+, 3HeH+, and 3 HeD+ We have observed infrared spectra of the hot band v= 2 left-arrow 1 of HeH + and fundamental bands of isotopic species HeD +, 3 HeH +, and 3 HeD +, and obtained the Dunham coefficients Y kl, and the isotopically independent parameters U kl, Δ He kl, and Δ H kl Isotopic species of the HeH + molecular ion provide an excellent testing ground for studying isotopic dependence of vibration-rotation constants because of the small masses of He and H isotopes. International Nuclear Information System (INIS)Ĭrofton, M.W. Infrared spectra of 4HeH+, 4 HeD+, 3HeH+, and 3 HeD+