Fig. 2 | Nature Communications

Fig. 2

From: Route to high-energy density polymeric nitrogen t-N via He−N compounds

Fig. 2

Crystal structures of HeN4. Energetically favorable structures of HeN4 with space groups C2/c (a), P\(\bar 1\) (b) and I41/a (c). Small blue and large black spheres represent N and He atoms, respectively. Three-dimensional valence electron localization functions with isosurface value of 0.95 for the C2/c structure (d), and of 0.9 for the P\(\bar 1\) (e) and the I41/a (f) structures

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