How to start emitters alternately?

Hello,
I dont know if im to new to Niagara, or this is not possible.
I want to start a emitter after the other one finished. And after the new one the other one starts again.
I know i can set a delay, but if both have the same delay they both start anyway at the same time. I just need for one Emitter that dont start with the delay and its done.
How can i achirve this?