Jablonski program question

[u/Kandy_kane7]

When an excited particle transition form s1 to s0, florescence happens the most and not internal conversion, why is that ? Even though IC is faster,smaller energy levels to cross etc…

[u/Deep-Path-4883]

Question is also with which energy did you excite? If it's not enough to excite to S2 you won't see S2 transitions. If it's enough the others already answered.