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Citation: ZHEN Cheng, HU Ya-Hua, LIU Shi-Lin, ZHOU Xiao-Guo. Absorption Spectrumand Dissociation Dynamics of the C¹∏ State of N₂O[J]. Acta Physico-Chimica Sinica, ;2010, 26(01): 94-98. doi: 10.3866/PKU.WHXB20100135 shu

Absorption Spectrumand Dissociation Dynamics of the C¹∏ State of N₂O

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: 17 September 2009
Available Online: 4 December 2009

The absorption spectrum of the N2O molecule in the wavelength range of 143.6-146.9 nm was measured under the jet-cooled condition by using the high resolution vacuum ultraviolet radiation, which was generated by resonance-enhanced difference-frequency mixing, corresponding to the C1∏←X1∑+ transition. Three vibrational bands were observed with frequency intervals of 521 and 482 cm -1, and they were superimposed on a wide absorption background. Previous high-level quantum chemical calculations indicate that the C1∏ state of N2O is dissociative along the N—O elongation, while it is bound along the N—N bond stretching or N2O bending. Therefore, the observed vibrational progression is a Feshbach resonance of the dissociative transition state. From an anti-Fourier transformation analysis, the recurrence period of the unstable periodic orbit of the Feshbach resonance was found to be 61 fs and the corresponding vibrational frequency was 546 cm-1. Since this vibrational frequency is close to the frequency of the bending motion, the unstable periodic orbit is mostly composed of the bending motion of the C1∏ state coupled with dissociation. The N—N stretching vibration does not participate in its formation. Therefore, we describe the excitation-dissociation dynamics of the C1∏state of N2O clearly.
- Absorption spectrum,
- N2O,
- Vacuumultraviolet,
- Dissociation
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沈阳化工大学材料科学与工程学院沈阳 110142

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Absorption Spectrumand Dissociation Dynamics of the C¹∏ State of N₂O