Citation: 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 Physico-Chimica Sinica, ;2011, 27(08): 1797-1802. doi: 10.3866/PKU.WHXB20110717 shu

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

1.
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 Date: 28 February 2011
Available Online: 23 May 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)

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.
- Dissociation dynamics,
- Photoionization,
- Threshold photoelectron spectrum,
- Photoelectron-photoion coincidence,
- Velocity map imaging
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Dissociation Dynamics of O⁺ Formation Channels from Vibrational State-Selected NO₂⁺ at e³B₂ State