Carbon/hydrogen clusters [CnHx+] formation from laser irradiation of coronene

23rd Congress of the International Commission for Optics

Betancourt, F.^1 ; Poveda, J.C.^2 ; Alvarez, I.^1 ; Guerrero, A.^1 ; Cisneros, C.^1

Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Av. Universidad s/n, Col. Chamilpa, Mor. Cuernavaca, Mexico^1

Laboratorio de Espectroscopia Atómica Molecular, Escuela de Quimica, Universidad Industrial de Santander Carrera, 27 Calle 9, Bucaramanga, Santander, Colombia^2

关键词: Exposed to;    Ionic species;    Laser desorption;    Laser irradiance;    Molecular jet;    Photo-induced;    Photoproducts;    Time-of-flight mass spectrometers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/605/1/012021/pdf
DOI  :  10.1088/1742-6596/605/1/012021

来源: IOP

【 摘 要 】

This article presents the photo induced dehydrogenation of a cooled molecular jet of coronene, exposed to 266 nm laser radiation. Using unfocused laser radiation of 1064 nm, synchronously coupled with the ionization laser pulses, a system recently developed. Molecular beams were produced by laser desorption of coronene. Analysis of the photoproducts made by time-of flight mass spectrometer showed that a wide variety of ionic species were formed; more than 300 different species were observed. The results showed carbon clusters C+nwith n up to 24 as well as carbon/hydrogen clusters C+nH+xwith masses higher than 300 m/z. The effect on the laser irradiance on the formation of different ions, in the rage from 109W/cm2 to 1010W/cm2, is discussed as it is reflected on the evolution from the big ions to the smaller ones.