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Communication: The absolute shielding scales of oxygen and sulfur revisited
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We present an updated semi-experimental absolute shielding scale for the 17O and 33S nuclei. These new shielding scales are based on accurate rotational microwave data for the spin–rotation constants of H2
17O [Puzzarini et al., J. Chem. Phys. 131, 234304 (2009)], C17O [Cazzoli et al., Phys. Chem. Chem. Phys. 4, 3575 (2002)], and H2
33S [Helgaker et al., J. Chem. Phys. 139, 244308 (2013)] corrected both for vibrational and temperature effects estimated at the CCSD(T) level of theory as well as for the relativistic corrections to the relation between the spin–rotation constant and the absolute shielding constant. Our best estimate for the oxygen shielding constants of H2
17O is 328.4(3) ppm and for C17O −59.05(59) ppm. The relativistic correction for the sulfur shielding of H2
33S amounts to 3.3%, and the new sulfur shielding constant for this molecule is 742.9(4.6) ppm.
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