Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
2.
College of Mathematics, Physics and Information Engineering, Jiaxing University, Jiaxing 314001, China
Funds: This work was supported by the National Natu-ral Science Foundation of China (No.10979042 and No.21073173), the National Key Basic Research Spe-cial Foundation of China (No.2007CB815204), and the Fundamental Research Funds for the Central Universi-ties. A
The absorption spectrum of the C1∏ state of N2O molecule in the wavelength range of 142.5～147.5 nm has been measured under the jet-cooled condition, and the clear spectral features are displayed. A vibrational progression is observed with a frequency interval of about 500 cm-1. With the aid of potential energy surfaces (PES) of the low-lying electronic states of N2O, the vibrational progression is assigned as the bending mode of the repulsive C1∏ state. From the Fourier transformation analysis, the recurrence period of the peri-odic orbit near the transition state region is derived to be 65 fs. Through the least-square Lorentzian fitting, the lifetimes of the resonance levels are estimated from their profile widths to be about 20 fs, which is shorter than the recurrence period. Therefore, a new explanation is suggested for the observed diffuse spectral structure, based on the behavior of dissociating N2O on PES of the C1∏ state in the present excitation energy range.
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