Raman Spectra of Translational Lattice Vibrations in Polar Ice

Abstract

We measured the Raman spectra of Mizuho and Nansen ice recovered from Antarctica, and Dye-3 ice recovered from Greenland, to observe the translational lattice vibrations in polar ice. Since we investigated the effect of the aging on the ice and the ice temperature on the spectra, we chose to study the ice from three different sites. The ages of the ice Ih range from 4.6 to 100 kyr. The ice temperatures at the depth it was located range from 231 to 260 K. The results were compared with the measurements taken of the Vostok ice by Fukazawa et al. We found that the relative intensity of the peak at 300 cm-1 increased as the temperature at which the ice was kept for a long period increased from 214 to 237 K. Since this peak is assigned to a translational lattice vibration traveling along the hydrogen-bonding network, we conclude that the structure of the network in the polar ice varies with time at a very slow rate to attain an equilibrium state that has never been found on the laboratory time scale.

Ice perfection and onset of anomalous preservation of gas hydrates

“…It is intriguing in the present context that a number of spectroscopic properties of ice I h show a change in behaviour near 240 K. The temperature dependency of the NMR spinlattice relaxation time T 1 for pure ice I h samples shows a change of slope 32 as does the real part of dielectric permittivities 33 and the temperature dependency of the frequency of the translational lattice vibrations as observed by Raman spectroscopy. 33,34 This suggests that intrinsic defects, most probable of the Bjerrum-type, reach such degrees of mobility and concentration that cooperative displacements of water molecules became possible on laboratory timescales at temperatures near 240 K. Such phenomena were discussed for the movement of dislocations in ice. 35 Similar processes appear also to be operative for the annealing of stacking faults.…”

Microwave dielectric properties of the ice core from Dome Fuji, Antarctica

“…Moreover, we also report the temperature dependence of the frequency of translational lattice vibrations in the ice core by Raman spectroscopy for further discussion of phase transition of ice crystals according to the temperature change, since recent studies of the Raman spectra of lattice vibrations of the polar ice indicated that the proton arrangement in the polar ice which had been stored below 237 K for a long time varied with the ice temperature [Fukazawa et al, 1996[Fukazawa et al, , 1997].…”

Raman scattering and neutron-diffraction studies of fresh ice and Antarctic ice

“…Fukazawa and others (1996, 1997, 1998b) investigated the Raman scattering of translational lattice vibrations in Antarctic ice and found that the ratio of peak intensities at 300 and 220 cm –1 , I R , depended on the ice temperature, T i, in the ice sheet. An incident laser beam with a diameter of 1 μm was focused on an appropriate crystal grain.…”