▁and ▁catal ysis ▁of ▁the ▁polym er ization ▁of ▁epo x ides . ▁ ▁An ▁example ▁of ▁a ▁photo ac id ▁which ▁under go es ▁excited - state ▁pro ton ▁transfer ▁without ▁prior ▁phot ol ysis ▁is ▁the ▁flu ores cent ▁d ye ▁py ran ine ▁( 8 - h ydro xy - 1 , 3 , 6 - py ren et ris ulf on ate ▁or ▁H PT S ). ▁ ▁För ster ▁cycle ▁The ▁För ster ▁cycle ▁was ▁proposed ▁by ▁The odor ▁För ster ▁and ▁comb ines ▁knowledge ▁of ▁the ▁ground ▁state ▁acid ▁dis soci ation ▁constant ▁( p K a ), ▁absor ption , ▁and ▁flu ores c ence ▁spect ra ▁to ▁predict ▁the ▁p K a ▁in ▁the ▁excited ▁state ▁of ▁a ▁photo ac id . ▁ ▁References ▁ ▁Category : Ph ot och em istry ▁Category : L ith ography ▁( m icro fab ric ation ) ▁Category : M icro techn ology ▁Category : Light - sens itive ▁chemical s ▁Category : Ac ids <0x0A> </s> ▁ 7 : 8 4 ▁was ▁a ▁Scottish ▁left - wing ▁ag it prop ▁theatre ▁group . ▁The ▁name ▁comes ▁from ▁a ▁stat istic , ▁published ▁in ▁The ▁Econom ist ▁in ▁ 1 9 6 6 , ▁that ▁ 7 % ▁of ▁the ▁population ▁of ▁the ▁UK ▁owned ▁ 8 4 % ▁of ▁the ▁country ' s ▁wealth ▁( compare ▁the ▁P are to ▁principle ). ▁ ▁The ▁group ▁was ▁founded ▁by ▁play w right ▁John ▁Mc Gr ath , ▁his