Coupling of collective excitation in proton and photon interaction with PAHs

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

Mishra, P.M.^1 ; Avaldi, L.^2 ; Bolognesi, P.^2 ; Prince, K.C.^3 ; Rajput, J.^4 ; Richter, R.^3 ; Safvan, C.P.^5 ; Vig, S.^6 ; Kadhane, U.R.^7

Max-Planck Institut für Kernphysik, Heidelberg

69117, Germany^1

CNR-Instituto di Metodologie Inorganiche e Dei Plasmi, Monterotondo

CP10-00016, Italy^2

Elettra-Sincrotrone Trieste, Area Science Park, Strada Statale 14, km 163.5, Basovizza

I-34149, Italy^3

Department of Physics and Astrophysics, University of Delhi, Delhi

110007, India^4

Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi

110067, India^5

Department of Earth and Space Science, Indian Institute of Space Science and Technology, Trivandrum

695547, India^6

Department of Physics, Indian Institute of Space Science and Technology, Trivandrum

695547, India^7

关键词: Collective excitation mode;    Collective excitations;    Collision experiments;    Electronic energy loss;    Evaporation process;    Fragmentation process;    Intermediate velocities;    Photon interactions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/11/112059/pdf
DOI  :  10.1088/1742-6596/635/11/112059

来源: IOP

【 摘 要 】

Collective excitation in polycyclic aromatic hydrocarbon molecule is studied in collision experiments with intermediate velocity (50-180 keV) proton and FUV (15-40 eV) photon energy. In proton impact experiments a clear comparison between pure ionization and capture ionization (or pure capture) process is done on the basis of ionization, evaporation, fragmentation process as a function of impact energy. Two mechanisms: large impact parameter collective excitation mode and closer encounters with higher amount of electronic energy loss leading to fragmentation were observed in proton collision process. The photon impact results were used to understand the origin of evaporation processes.