What is the reaction steps taken when producing auroral forcing?

As described in here:


<https://www.nasa.gov/feature/goddard/2018/sounding-rocket-mission-will-trace-auroral-winds>


A mixture of Trimethylaluminium, Barium and Strontium reacts and ionize in the upper atmosphere to produce the spectral emission seen. What is the exact reaction pathway taking place?


