title: Vacuum ultraviolet photofragmentation of octadecane: photoionization mass spectrometric and theoretical investigation.
abstract: The photoionization and fragmentation of octadecane were investigated with infrared laser desorption/tunable synchrotron vacuum ultraviolet (VUV) photoionization mass spectrometry (IRLD/VUV PIMS) and theoretical calculations. Mass spectra of octadecane were measured at various photon energies. The fragment ions were gradually detected with the increase of photon energy. The main fragment ions were assigned to radical ions (CnH2n+1+,n= 4-11) and alkene ions (CnH2n+,n= 5-10). The ionization energy of the precursor and appearance energy of ionic fragments were obtained by measuring the photoionization efficiency spectrum. Possible formation pathways of the fragment ions were discussed with the help of density functional theory calculations.
authors.affiliation: College of Science, China University of Petroleum, Qingdao, 266580 Shandong People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Xu
authors.affiliation: College of Science, China University of Petroleum, Qingdao, 266580 Shandong People's Republic of China.
authors.forename: Pengpeng
authors.initials: P
authors.lastname: Sang
authors.affiliation: College of Science, China University of Petroleum, Qingdao, 266580 Shandong People's Republic of China.
authors.forename: Lianming
authors.initials: L
authors.lastname: Zhao
authors.affiliation: College of Science, China University of Petroleum, Qingdao, 266580 Shandong People's Republic of China.
authors.forename: Wenyue
authors.initials: W
authors.lastname: Guo
authors.affiliation: National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029 Anhui People's Republic of China.
authors.forename: Fei
authors.initials: F
authors.lastname: Qi
authors.affiliation: College of Science, China University of Petroleum, Qingdao, 266580 Shandong People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xing
authors.affiliation: State Key Laboratory of Heavy Oil Processing, Key Laboratory of Catalysis, China University of Petroleum, Qingdao, 266580 People's Republic of China.
authors.forename: Zifeng
authors.initials: Z
authors.lastname: Yan
keywords: Alkanes; Mass spectrometry; Photoionization; Synchrotron vacuum ultraviolet