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首页> 美国政府科技报告 >Exp 12 C/ exp 13 C and H/D Vapor Pressure Isotope Effects of Fluoroform: Intermolecular Interactions in Liquid Fluoroform
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Exp 12 C/ exp 13 C and H/D Vapor Pressure Isotope Effects of Fluoroform: Intermolecular Interactions in Liquid Fluoroform

机译：Exp 12 C / exp 13 C和H / D蒸气压同位素对氟化物的影响：液体氟化物中的分子间相互作用

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A precision cryostat of the Bigeleisen-Brooks-Ribnikar-Ishida (BBIR) type with associated vacuum systems has been constructed and the appropriate temperature/pressure measurement and control systems designed and implemented. Various improvements in the cryostat design were incorporated in order to facilitate the assembly and repair processes. A major design change involved the incorporation of a digital stand alone computer to control cryostat operations. This apparatus was used to measure the exp 12 C/ exp 13 C and H/D Vapor Pressure Isotope Effects of Fluoroform. Analysis of the measured VPIE results, in light of existing experimental data and theories, has demonstrated the need of a temperature dependent liquid force field, specifically a temperature-dependent interaction force constant between the C-H stretching motion and translational motion in the direction of the figure axis of CHF sub 3 . This result is consistent with the observed spectroscopic data and vibrational and configurational models of fluoroform dimers. The intermolecular interaction is believed to be a weak hydrogen-bond in nature. (ERA citation 81:026452)

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