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The precise molecular structures of arsenic triiodide and gallium triiodide in the vapor phase have been determined by the sector-microphotometer method of electron diffraction at the nozzle temperatures of 230°C and 255°C respectively. The results of gallium triiodide have confirmed the regular triangle structure of the molecule. The force constants of these molecules have been estimated from the observed mean amplitudes.
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Morino et al. (1966) studied this question.
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