Formula omitted] isotope effect in the UV photodissociation of N 2O

Abstract

14 N 2 16 O , 14 N 15 N 16 O and 15 N 14 N 16 O were photolyzed between 202 and 206 nm. The photodissociation products, O( 1 D 2) and N 2( X 1 ∑ g +) , were monitored by a resonance-enhanced multiphoton ionization technique. The O( 1 D 2) signal was weaker when the heavy isotopomers were photolyzed at 205.47 nm. The isotope effect was as large as 10% for 14 N 15 N 16 O , while it was 3% for 15 N 14 N 16 O . The absorption coefficients must be smaller for the heavy isotopomers. An inverse isotope effect was observed when N 2( X 1 ∑ g +) was monitored via the a″ 1 ∑ g + state. 14 N 2 signal was less than that for 14 N 15 N . There must be an isotope effect in the detection efficiency of highly rotationally excited N 2( X 1 ∑ g +) .