Abstract
Gas-phase 14N and 15N NMR studies of nitrogen and synthetic air pressurized up to 300 bar were performed. It was found that the magnetic shielding of an isolated N2 molecule, σ0(N) = −63.4(2) ppm, is in good agreement with the results of ab initio calculations. The binary N2-O2 interactions contribute to shielding an order of the magnitude larger than the N2-N2 pairs. For nitrogen the three body collisions become observable by NMR for pressure higher than 200 bar and the appropriate coefficient can be practically assigned to the interaction between one molecule of N2 and a pair of O2 molecules.
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