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The microwave spectrum of the weakly bound complex NH3–acetylene has been measured by molecular beam electric resonance spectroscopy. A spectrum characteristic of a symmetric top is observed and the following spectroscopic constants are determined: The observed spectrum is consistent with an axially symmetric complex in which the acetylene hydrogen bonds to the ammonia with a hydrogen bond length of 2.33 Å.
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Fraser et al. (1984) studied this question.
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