振动态选择的NO2+离子e3B2态解离生成氧离子通道的动力学

doi:10.3866/PKU.WHXB20110717

Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (08): 1797-1802.doi: 10.3866/PKU.WHXB20110717

• THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY • Previous Articles Next Articles

Dissociation Dynamics of O⁺ Formation Channels from Vibrational State-Selected NO₂⁺ at e³B₂ State

NIU Ming-Li¹, SONG Lei¹, TANG Xiao-Feng¹, ZHOU Xiao-Guo¹, LIU Shi-Lin¹, LIU Fu-Yi², SHAN Xiao-Bin², SHENG Liu-Si²

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;
2. National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, P. R. China

Received:2011-02-28 Revised:2010-04-06 Published:2011-07-19
Contact: ZHOU Xiao-Guo E-mail:xzhou@ustc.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (10979042, 21073173) and National Key Basic Research Program of China (973) (2007CB815204).

Abstract

Abstract:

The dissociation dynamics of vibrational state-selected NO₂⁺(e³B₂) was investigated using threshold photoelectron-photoion coincidence velocity imaging and photoionization by synchrotron radiation. The vibrational resolution threshold photoelectron spectrum of NO₂⁺ (e³B₂) was recorded in the energy range of 18.8-19.2 eV and was consistent with previous measurements. Furthermore, the coincident velocity images of the O⁺ fragments that dissociated from the (0,0,0) and (1,0,0) vibronic levels of NO₂⁺ (e³B₂) showed a multi-ring structure, indicating that O⁺ fragments with different speeds were produced during dissociation as well as corresponding NO molecules with different internal energy distributions. The total kinetic energy released distributions and the angular distributions of O⁺ during dissociation were obtained subsequently from the images. The internal energy distributions of the NO (X²Π) fragments that dissociated from the two vibrational states of NO₂⁺(e³B₂) were very similar and consisted of 3-5 dominant populated vibronic levels. The available energy released from dissociation was found to be almost evenly distributed between the kinetic and internal energies of the fragments and, specifically, a total kinetic energy of 52% and an internal energy of 48% were obtained. In addition, the anisotropy parameter, β, of the O⁺ fragments was about 0.3 and was hardly dependent on the vibrational quantum number of the NO(X²Π) fragment.

Key words: Dissociation dynamics, Photoionization, Threshold photoelectron spectrum, Photoelectron-photoion coincidence, Velocity map imaging

NIU Ming-Li, SONG Lei, TANG Xiao-Feng, ZHOU Xiao-Guo, LIU Shi-Lin, LIU Fu-Yi, SHAN Xiao-Bin, SHENG Liu-Si. Dissociation Dynamics of O⁺ Formation Channels from Vibrational State-Selected NO₂⁺ at e³B₂ State[J]. Acta Phys. -Chim. Sin. 2011, 27(08), 1797-1802. doi: 10.3866/PKU.WHXB20110717

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Dissociation Dynamics of O⁺ Formation Channels from Vibrational State-Selected NO₂⁺ at e³B₂ State

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Dissociation Dynamics of O⁺ Formation Channels from Vibrational State-Selected NO₂⁺ at e³B₂ State