Collision theory predicts the spectral peak of the sodium D-line to have a red-shift dependent on pressure and temperature. Using the serendipitous presence of sodium in octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), the authors calibrate the D-line shift up to 1.5 GPa during deflagration.
- Olivia J. Morley
- David M. Williamson