Electron impact fragmentation of pyrrole molecules studied by fluorescence emission spectroscopy

Abstract

Abstract-The fluorescence emission spectroscopy using electron impact excitation technique was employed to study fragmentation processes of the gas phase pyrrole molecules. The following excited fragmentation species were observed by detection of their fluorescence decay: the atomic hydrogen H(n), n = 4-7 and the diatomic CH(A 2 Δ), CN(B 2 Σ + ), NH(A 3 Π) and C2(d 3 Πg) fragments. These atomic and molecular products differ from those previously reported in fragmentation of pyrrole and their identification gives a new insight into dissociation and fragmentation channels of the excited states of pyrrole molecules.

Low-Energy Electron Scattering from Pyrrole and Its Isomers

“…The DEA study of pyrrole and its isomers can be applied to astrochemistry due to its reactive nature, producing more giant astrophysical N -heterocyclic molecules. Other reactive ions (C 4 H 3 N – , C 4 H 2 N – , C 2 H 2 N – , C 2 HN – , and CN – ) , may also be possible through the DEA study of pyrrole and its isomers. Mostly, the weak bond breaks first; hence, the possibility of a C 4 H 4 N – ion is higher than that of other negative ions.…”

Two-body dissociation of isoxazole following double photoionization – an experimental PEPIPICO and theoretical DFT and MP2 study

“…Many experiments probing heterocyclic molecules' absorption, excitation, ionization, and isomerization have thus been reported in the literature. Some have been performed using strong-field ionization, 10,11 excitation and dissociation by laser light, 12,13 and synchrotron radiation, 14,15 or impact with charged particles: electrons 16,17 or ions. [18][19][20][21][22][23] Specifically, in photochemical reactions, heterocyclic molecules have shown potential to withstand or transform light efficiently 8,24,25 and can therefore be readily utilized as photoactive molecular entities.…”