Fig. 1 The Raman spectra: The black line and blue line are the Raman spectra for KN3 raw material (R) and polymerized KN3 (PPA), where the finger print peak indicative of cg-N is detected. (IMAGE)

Science China Press

Fig. 1 The Raman spectra: The black line and blue line are the Raman spectra for KN3 raw material (R) and polymerized KN3 (PPA), where the finger print peak indicative of cg-N is detected.

Caption

The Raman spectrum of cg-N at 110 GPa extracted from experimental observation and the calculated vibron position of cg-N from the A mode at 35 GPa are shown in the bottom panel, which can be extrapolated linearly to ambient pressure as shown by the dashed line.

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