In hexagonal ice

TABLE 9-XXVIII Oxygen-Oxygen Distances in Hexagonal Ice and Heavy Ice. ... 

Figure 3. Pair interaction energy distribution for individual water molecules for TIP4P (solid line) and CC (dotted line) potentials in hexagonal ice.

Figure 1. Two H-bonded ( ) water molecules with various numbers of H-bonded (---------) neighbors (a) six neighbors, like in hexagonal ice, (b)...

Two water molecules connected by hydrogen bond in hexagonal ice can have four possible configurations. These configurations are distinguished by the relative orientations of the two molecules and termed for obvious reasons as c-cis, h-cis, c-trans, and h-trans. (See Figure 2) Occurrence of symmetry permitted dimer orientations is a characteristic feature of each ice polymorph. In the proton-ordered structures the occurrence of orientations is... 

THEORETICAL STUDY ON GASES IN HEXAGONAL ICE INVESTIGATED BY THE MOLECULAR ORBITAL METHOD... 

Tajima, Y., Matsuo, T. and Suga, H. (1984). Calorimetric study of phase transition in hexagonal ice doped with alkali hydroxides. J. Phys. Chem. Solids 45, 1135-1144. 

Bamaal, D. E. Lowe, I. L. (1967). Experimental free-induction-decay shapes and theoretical second moments for hydrogen in hexagonal ice. y. Chem. Phys. 46, 4800-9. [33]... 

The diffusivity of hydrogen molecules is mostly studied for hexagonal ice and sll clathrate structure. Strauss [23] showed by neutron inelastic scattering that the diffusion coefficient of H2 in deuterated ice at 25-60 K is rather high and comparable with the self-diffusion coefficient in liquid hydrogen. About 272 K, hydrogen solubility in hexagonal ice is comparable with that in liquid water at atmospheric pressure and differs by two times at 100 MPa [24]. 

Figure 44. It must be mentioned in this case that the hydrogen atoms within the (H20)g ring show a twofold disorder and the axial hydrogen atom is hydrogen bonded to one of the terminal oxygen atoms of the polyoxovanadate cage Vig042(S04). It has also been described that this chair conformation and the disordered hydrogen atoms of the (H20)e ring are found in hexagonal ice (It) as well as in the metastable cubic ice (Ic)- " ...

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