High-resolution Fourier transform microwave spectra of the unstable species ClPO 2 have been measured, and the P and Cl spin-rotation coupling constants have been determined from the resolved hyperfine splittings. These constants have been used to derive the absolute nuclear shielding parameters for
The nuclear magnetic shielding and spin-rotation constants of the hydrogen molecule
✍ Scribed by Jacek Komasa; Jacek Rychlewski; William T. Raynes
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 435 KB
- Volume
- 236
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The variation-perturbation method, employing an explicitly correlated basis set in the form of Gaussian functions with exponential correlation factors, has been used to calculate the paramagnelic component of the nuclear magnetic shielding and the electronic contribution to the spin-rotation constant for the hydrogen molecule in its ground state. The diamagnetic components of the shielding tensor have also been computed. The computations have been performed for three internuclear distances in the vicinity of equilibrium. A comparison of the calculated quantities, which are of high accuracy, with the experimental data reveals a small but significant discrepancy between theory and experiment.
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high resolution study of the rotational spectrum of CH3 35Cl in the vlbrstional ground state has been performed using a molecular beam spectrometer. By fitting the measured transitions to an appropriate molecular hamiltonian the vaIues of the following molecular parameters have been obtained: B = 13
The nuclear magnetic shielding tensor and the spin-rotation constant of the hydrogen molecule have been studied at the full configuration interaction level using a sequence of systematically enlarged basis sets which allow extrapolation to the basis set limit. The computed and experimental values fo
## Abstract We present calculations of indirect nuclear spin–spin coupling constants in large molecular systems, performed using density functional theory. Such calculations, which have become possible because of the use of linear‐scaling techniques in the evaluation of the Coulomb and exchange‐cor