Inelastic-neutron-scattering study at low temperature of the quantum sine-Gordon breather in 4-methyl-pyridine with partially deuterated methyl groups.
Abstract Inelastic neutron scattering spectra of 4-methyl-pyridine with the partially deuterated methyl (4MP-CH 2 D) are interpreted within the quantum sine-Gordon theory. The bands are assigned to the quantized travelling states of the breather. The band splitting corresponds to different chain conformations.
Equations have been developed for describing the isotherms of extraction of rare-earth metal(III) [REM(III)] nitrates from aqueous concentrated solutions by 100% diisoamyl methylphosphonate, taking into account the variation of activity coefficients of components in the organic phase when its composition is varied within broad limits. The thermodynamic parameters of the extraction equilibria have been calculated using as the standard states hypothetical one-molal aqueous REM(III) nitrate solutions and pure components of the organic phase at a mole fraction of 1.0.