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- W2042897130 abstract "Abstract Chemical reactions of F atoms with NH3 molecules in a solid argon matrix were studied with electron paramagnetic resonance (EPR) spectroscopy. Fluorine atoms were generated by UV photolysis of F2 molecules in dilute solutions of F2 and NH3 in solid Ar. To distinguish reactions of photogenerated translationally excited F atoms (at 15 K) from reactions of diffusing thermal F atoms (at T>20 K ) experiments were conducted at different temperatures. The radical–molecular complex NH2–HF is observed for the first time as an intermediate product in reactions involving both types of F atoms. The hyperfine (hf) constants of the NH2–HF complex: a N =1.20 mT , a H =2.40 mT , and a F =0.70 mT , were determined from analysis of EPR spectra in isotopic substituted samples ( 14 N → 15 N , and H→D). The performed calculations revealed that complex NH2–HF has a planar C2v structure and a binding energy of 12.3 kcal/mol. Optimisation of arrangement of the complex in an argon lattice shows that the complex suffers a minor distortion in crystalline lattice relative to its equilibrium geometry in a gas phase. Calculated hf constants of the complex are in good agreement with those observed in EPR experiments." @default.
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- W2042897130 date "2000-02-01" @default.
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- W2042897130 title "EPR spectroscopy of the radical–molecular complex NH2–HF formed in low temperature chemical reaction of fluorine atoms with NH3 molecules trapped in solid argon" @default.
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- W2042897130 doi "https://doi.org/10.1016/s0022-2860(99)00300-2" @default.
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