  →   4 p ▁( ), ▁ 6 s   →   4 p ▁( 7 4 0 0 – 7 9 5 0   cm − 1 ), ▁ 7 s   →   4 p ▁( pred icted ▁at ▁, ▁but ▁obsc ured ), ▁ 8 s   →   4 p ▁( ), ▁ 5 d π   →   4 p ▁( ), ▁ 5 p   →   6 s ▁( band ▁origin ▁ 3 6 8 1 . 1 7 1   cm − 1 ), ▁ 4 f   →   5 s ▁( ▁and ▁ ▁band ▁origin ▁for ▁Ar D ▁and ▁Ar H ), ▁ 4 f   →   3 d π ▁( 7 5 4 8 . 7 6 ▁and ▁ 7 6 2 6 . 5 8   cc m − 1 ), ▁ 4 f   →   3 d δ ▁( 6 0 3 8 . 4 7 ▁and ▁ 6 0 2 6 . 5 7   cm − 1 ), ▁ 4 f   →   3 d σ ▁( 4 3 5 1 . 4 4   cm − 1 ▁for ▁Ar D ). ▁The ▁trans itions ▁going ▁to ▁ 5 s , ▁ 3 d π   →   5 s ▁and ▁ 5 d π   →   5 s , ▁are ▁strongly ▁pre dis soci ated , ▁bl urr ing ▁out ▁the ▁lines . ▁In ▁the ▁U V ▁spectrum ▁a ▁continuous ▁band ▁exists