Separation of Water into Its Ortho and Para Isomers

  title={Separation of Water into Its Ortho and Para Isomers},
  author={Vladimir I Tikhonov and Alexander A. Volkov},
  pages={2363 - 2363}
Polyatomic molecules can exist as nuclear spin isomers. For example, the ortho and para hydrogen spin isomers are characterized by different values of specific heat, boiling point, heat of vapor formation, and so forth ([1][1]). Hydrogen has been the only substance whose spin modifications are well 
Separating para and ortho water.
The production of isolated samples of both spin isomers is demonstrated in pure beams of para and ortho water in their respective absolute ground state, ideal targets for unraveling spin-conversion mechanisms and for spin-enhanced applications.
Spin states of para-water and ortho-water molecule in gas and liquid phases
Spin degrees of freedom of water molecule in gas and liquid state were investigated in order to provide a reasonable answer about the unsolved problem of a long-term behaviour of water spin isomers.
Effect of quantum differences of ortho and para H2O spin-isomers on water properties: Biophysical aspect
The biophysical mechanism of jump in the permeability of erythrocytes through a microcapillary in water-based physiological solution and at 37.4°C in heavy water is proposed and discussed.
On the possibility of enrichment of H2O nuclear spin isomers by adsorption
Experimental data on the enrichment of H2O nuclear spin isomers by means of adsorption, as suggested in several works by other authors, are reported. We were unable to observe any enrichment of
Ortho/para spin-isomers of H2O molecules as a factor responsible for formation of two structural motifs in water
It is shown that water on a nanometer scale can be associated with existence of two nuclear H2O spin isomers that have different probability to be in one or the other subphase.
Observation of rotational resonances of ortho and para spin isomers of the H2O molecule in hexagonal ice using four-photon laser spectroscopy
Rotational resonances of ortho and para spin isomers of the H2O molecule are observed in hexagonal ice using four-photon spectroscopy of coherent light scattering. It is experimentally shown that the
Deviations from the normal ortho/para ratio for water (3 : 1) in the vapor phase in dynamic sorption
Deviations of the ortho/para ratio from its normal value (3: 1) were observed by spectral selective detection of ortho and para water molecules when water vapor passed through a column with a
Observation of different reactivities of para and ortho-water towards trapped diazenylium ions
Water molecules exist as two distinct nuclear-spin isomers denoted ortho and para, and these two isomers are separate in the gas phase to show that they exhibit different reactivities in a prototypical proton-transfer reaction.
BWO spectroscopy of water spin isomers based on desorption from glycerol
Violation of the normal spin 3: 1 ortho/para ratio in saturated water vapor above a 0.5% water-glycerol solution was detected using the BWO spectroscopy method. The solution was prepared by pumping
Can ortho-para transitions for water be observed?
Ab initio calculations show that the hyperfine nuclear spin-rotational coupling constants are about 30 kHz, and these constants are used to explore the whole vibration-rotation spectrum with special emphasis on the coupling between nearby levels.


Measurements of the nuclear relaxation in water are reported. The transverse relaxation rate (1/T2) of the proton resonance is pH dependent. The effect is shown to be due to a spin‐spin splitting of
The Principles of Nuclear Magnetism
The Spectrum of Comet Hale-Bopp (C/1995 O1) Observed with the Infrared Space Observatory at 2.9 Astronomical Units from the Sun
Several broad emission features observed in the 7- to 45-micrometer region suggest the presence of silicates, particularly magnesium-rich crystalline olivine, similar to those observed inThe dust envelopes of Vega-type stars.