section in the middle of the page

hey I have one page with two sections and I would like to place the second section in the middle of the page. However, when I use vspace{} then it move if I write text under the second one.

documentclass[12pt]{scrartcl}
usepackage[a4paper]{geometry}
geometry{left=3.5cm,right=3.5cm,top=3cm,bottom=3cm}        

begin{document}

addsec[tocentry={}]{Zusammenfassung}

addsec[tocentry={}]{Abstract}  

end{document}