N2O+离子B2П态的光谱与光解离动力学

doi:10.3866/PKU.WHXB201503041

Abstract

Abstract:

N₂O⁺ ions in the X²П(0,0,0) ground state were prepared by (3+1) resonance-enhanced multiphoton ionization (REMPI) of jet-cooled N₂O molecules at 360.55 nm, and then photoexcited to various vibrational levels in the B²П state over a wavelength range of 243-278 nm, followed by dissociation. The photofragment excitation (PHOFEX) spectrum was recorded by measuring the intensity of NO⁺ ion fragments vs excitation wavelength. The rotational constants and spin-orbit coupling were obtained by fitting the rotational structures of the vibrational bands. Thus, the contributions of highly excited vibronic levels of A²Σ⁺ states were distinguished from the other bands, and the original band of B²П state was verified. The series of vibrational bands in the PHOFEX spectrum were assigned to the transition of B²П(v₁,v₂,v₃) ←X²П. The average released kinetic energy of dissociation from the various B²П(v₁,v₂,v₃) ionic states was obtained by fitting the spreading contour of the NO⁺ ion peak in time-of-flight mass spectra. Dissociation mechanisms of N₂O⁺(B²П) were proposed with the aid of the theoretical potential energy surfaces of N₂O⁺ ions.

Key words: N₂O⁺ ion, Resonance enhanced multiphoton ionization, Vibrational spectroscopy, Time-of-flight mass spectrum, Photodissociation

SUN Zhong-Fa, GAO Zhi, WU Xiang-Kun, TANG Guo-Qiang, ZHOU Xiao-Guo, LIU Shi-Lin. Excitation Spectra and Photodissociation Dynamics of the B²П State of the N₂O⁺ Ion[J]. Acta Phys. -Chim. Sin. 2015, 31(5), 829-835. doi: 10.3866/PKU.WHXB201503041

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Excitation Spectra and Photodissociation Dynamics of the B²П State of the N₂O⁺ Ion

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Excitation Spectra and Photodissociation Dynamics of the B²П State of the N₂O⁺ Ion