Non-statistical fragmentation of large molecules in collisions with atoms

29th International Conference on Photonic, Electronic, and Atomic Collisions

Stockett, M.H.^1,2 ; Adoui, L.^3,4 ; Anderson, E.K.^1 ; Chen, T.^1 ; Chesnel, J.-Y.^3,4 ; De Ruette, N.^1 ; Gatchell, M.^1 ; Giacomozzi, L.^1 ; Huber, B.A.^3 ; Kulyk, K.^1 ; Maclot, S.^3,4 ; Rousseau, P.^3,4 ; Wolf, M.^1 ; Zettergen, H.^1 ; Schmidt, H.T.^1 ; Cederquist, H.^1

Department of Physics, Stockholm University, Stockholm, Sweden^1

Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark^2

Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), CEA-CNRS-ENSICAEN-UCBN, Caen, France^3

Université de Caen Basse-Normandie, Caen, France^4

关键词: Billiard balls;    Center-of-mass energies;    Fragmentation patterns;    Fragmentation process;    Molecules collide;    Polycyclic aromatic hydrocarbon (PAH);    Single atoms;    Theoretical study;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/1/012036/pdf
DOI  :  10.1088/1742-6596/635/1/012036

来源: IOP

【 摘 要 】

Non-statistical fragmentation processes are important when Polycyclic Aromatic Hydrocarbon (PAH) molecules, fullerenes, or other large molecules collide with atoms at center- of-mass energies from a few tens to a few hundreds of eV. The typical result is the prompt, billiard-ball-like knockout of single atoms (CHx-loss). This is distinct from the well-known statistical fragmentation patterns of these molecules, which are dominated by H- and C2H2-loss for PAHs and C2-loss for fullerenes. We have explored the role of non-statistical fragmentation of PAHs and fullerenes in a series of experimental and theoretical studies. In general, the yield of non-statistical fragments depends sensitively on their stability against secondary statistical fragmentation following knockout.