Citation: WU Man-Man, TANG Xiao-Feng, NIU Ming-Li, ZHOU Xiao-Guo, DAI Jing-Hua, LIU Shi-Lin. Ionization and Dissociation of Methyl Chloride in an Excitation Energy Range of 13-17 eV[J]. Acta Physico-Chimica Sinica, ;2011, 27(12): 2749-2754. doi: 10.3866/PKU.WHXB20112749 shu

Ionization and Dissociation of Methyl Chloride in an Excitation Energy Range of 13-17 eV

1.
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics,University of Science and Technology of China, Hefei 230026, P. R. China

Received Date: 21 September 2011
Available Online: 14 October 2011
Fund Project: 国家自然科学基金(10979042, 21073173) (10979042, 21073173)国家重点基础研究发展规划项目(973) (2007CB815204)资助 (973) (2007CB815204)

Using threshold photoelectron-photoion coincidence time-of-flight mass spectrometry, the photoionization and photodissociation of methyl chloride in the excitation energy range of 13-17 eV were investigated. CH₃Cl⁺ ions in the A²A¹ and B²E excited states were generated, both of which were completely dissociative. CH₃⁺ fragments were mainly produced while CH₂Cl⁺ fragment ions were observed as well. By fitting the time-of-flight profile the kinetic energy released distributions of CH₃⁺ during the dissociation of the energy-selected CH₃Cl⁺ ions were obtained. The dissociation of the CH₃Cl⁺ (A²A¹) ion followed rapid direct fragmentation while that of the B²E state showed statistical dissociation. Moreover, with the aid of the calculated potential energy surface the CH2Cl + fragment ions observed in the A²A¹ state were generated from the statistical dissociation of the high vibrational excited CH₃Cl⁺ (X²E) ions produced by the autoionization of the CH3Cl molecule.
- Methyl chloride,
- Photoionization,
- Photodissociation,
- Time-of-flight mass spectroscopy,
- Potential energy surface
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沈阳化工大学材料科学与工程学院沈阳 110142