High-Pressure Synthesis and Study of NO⁺NO₃⁻ and NO₂⁺NO₃⁻ Ionic Solids

Figure 1

Vibrational modes assignment for O₂-N₂ mixture before laser heating at (a) 15 GPa and (b) 39 GPa; (d) NO⁺NO₃⁻ ionic crystal at 32 GPa  and (e) its lattice modes at 30 GPa after laser heating. Raman spectrum of untransformed O₂-N₂ mixture after laser heating at 32 GPa (c) is shown for comparison.