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000637977 1001_ $$0P:(DE-HGF)0$$aYachmenev, Andrey$$b0$$eCorresponding author
000637977 245__ $$aEnhancement of nuclear spin transitions as a resonance effect of isotope substitution
000637977 260__ $$aMelville, NY$$bAmerican Institute of Physics$$c2025
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000637977 520__ $$aMixing of different components of the total nuclear spin in the rovibrational states of isolated molecules is extremely weak. It has only been observed in hyperfine spectra for few systems, including S$_2$Cl$_2$, SiF$_4$, PH$_3$, and SF$_6$. We perform variational calculations of nuclear quadrupole interactions in the rotational spectra of S$_2$Cl$_2$ and CH$_2$Cl$_2$ and analyze the effects of breaking the molecular symmetry by isotopic substitution of one of the chlorine atoms. This symmetry breaking significantly enhances the mixing of nuclear spin states and produces a distinct spin polarization pattern with opposite spin orientations on the different isotopes. This enhancement arises as a resonance effect driven jointly by differences in isotopic masses and nuclear quadrupole coupling constants and gives rise to electric and magnetic dipole transitions between states with different relative orientations of the nuclear spin.
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000637977 7001_ $$0P:(DE-H253)PIP1107752$$aVogt, Emil$$b1
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