Experimental spectral width and derived lifetimes of n-AIH + isomers from Ref. Although one can find a handful of articles on 7-azaindole in isolated monomer, in dimeric forms and water and alcohol clusters, only one recent article to date shed light upon the photophysical relaxation mechanism of n-azaindole molecules by studying gasphase excited-state dynamics. Experiments and theoretical calculations have also been devoted to understanding the excited-state proton transfer and tautomerization mechanism of 7-azaindole with solvent molecules. On the other hand, very recently, Noble et al. performed photo-fragmentation spectroscopy on the protonated n-azaindole isomers (n-AIH + , n = 5, 6, 7) to explore the role of the n-nitrogen atom position on photodynamics. From the spectral line widths, they estimated the excited-state lifetimes ( )