- 作者: 江素玉、方永勝、巴穆罕、尚卡朗
- 作者服務機構: National Synchrotron Radiation Research Center, 101, Hsin Ann Road, Science-Based Industrial Park, Hsinchu 30077, Taiwan, R.O.C.
- 中文摘要: The dissociative photoionization of molecular-beam cooled CH2CO in a region of ~10-20 eV was investigated with photoionization mass spectrometry using a synchrotron radiation as the light source. Photoionization efficiency curves of CH2CO+ and of observed fragment ions CH2+, CHCO+, HCO+, C2O+, CO+, and C2H2+ were measured to determine their appearance energies. Relative branching ratios as a function of photon energy were determined. Energies for formation of these observed fragment ions and their neutral counterparts upon ionization of CH2CO are computed with the Gaussian-3 method. Dissociative photoionization channels associated with six observed fragment ions are proposed based on comparison of determined appearance energies and predicted energies. The principal dissociative processes are direct breaking of C=C and C-H bonds to form CH2+ + CO and CHCO+ + H, respectively; at greater energies, dissociation involving H migration takes place.
- 英文摘要: --
- 中文關鍵字: Dissociative photoionization; CH2CO; Gaussian-3 method.
- 英文關鍵字: --