科研之友
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摘要
The absorption spectrum of the on state of N(2)O 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 N(2)O, the vibrational progression is assigned as the bending mode of the repulsive C(1)Pi state. From the Fourier transformation analysis, the recurrence period of the periodic 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 N(2)O on PES of the C(1)Pi state in the present excitation energy range.
