氯甲烷分子在13至17 eV激发能量范围内的电离解离

doi:10.3866/PKU.WHXB20112749

Abstract

Abstract: 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.

Key words: Methyl chloride, Photoionization, Photodissociation, Time-of-flight mass spectroscopy, Potential energy surface

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 Phys. -Chim. Sin. 2011, 27(12), 2749-2754. doi: 10.3866/PKU.WHXB20112749

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

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