Predissociation in b 1Πu,v (v=1,4,5,6) levels of N2

Abstract

In a high-resolution laser spectroscopic study, using a tunable Fourier-transform limited light source in the extreme ultraviolet, the b 1Πu excited valence state of molecular nitrogen is reinvestigated for vibrational levels v=1, 4, 5, and 6. From line broadening of individual rotational levels excited state lifetimes were determined: τ(v=1)=1.1±0.3 ns, τ(v=4)=18±1 ps, τ(v=5)=205±25 ps, and τ(v=6)=350±75 ps. Additionally, the lifetime of the o3 1Πu, v=0 Rydberg state was determined: τ=240±50 ps. For the b 1Πu, v=1 state improved rotational constants were determined.