N2O+经由B2Пi←X2П跃迁的光解离机理研究

引用本文: 吴丹, 张立敏, 周丹娜. N₂O⁺经由B²П_i←X²П跃迁的光解离机理研究[J]. 物理化学学报, 2014, 30(8): 1575-1580. doi: 10.3866/PKU.WHXB201405202 shu

Citation: WU Dan, ZHANG Li-Min, ZHOU Dan-Na. Study on the Photodissociation Mechanism of N₂O⁺ via B²П_i←X²П Transitions[J]. Acta Physico-Chimica Sinica, 2014, 30(8): 1575-1580. doi: 10.3866/PKU.WHXB201405202 shu

N₂O⁺经由B²П_i←X²П跃迁的光解离机理研究

基金项目:
国家自然科学基金（21073177）资助项目

摘要:

在超声分子束条件下，利用360.50 nm的电离激光使N₂O分子经由[3+1]共振增强多光子电离（REMPI）产生纯净的N₂O⁺（X²Π（000））分子离子，用另一束解离激光在230-275 nm范围扫描获得N₂O⁺经由B²П_i←X²Π跃迁产生的光解碎片（NO⁺和N₂⁺）激发（PHOFEX）谱. 获得的光解碎片激发谱可以归属为B²П_i（00n）←X²Π（000）序列跃迁. 我们分别将线性三原子分子离子N₂O⁺中N―N伸缩振动简化成NO和N之间的简谐振动，N―O伸缩振动简化成N₂和O之间的简谐振动，用谐振子的简谐势能曲线和波函数对N₂O⁺分子离子X²Π和B²П_i电子态振动能级间跃迁的Franck-Condon因子进行计算，和实验得到的碎片离子增强谱实验强度进行比较，对前人给出的分子数据（分子平衡核间距）进行验证，讨论了N₂O⁺经由B²П_i（00n）←X²Π（000）电子态跃迁的光解离机理和碎片离子的分支比.

关键词:

English

Study on the Photodissociation Mechanism of N₂O⁺ via B²П_i←X²П Transitions

1.
Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China
Received Date: 15 April 2014
Available Online: 18 July 2014
Fund Project:
国家自然科学基金（21073177）资助项目

Abstract:

Photofragment (NO⁺ and N₂⁺) excitation (PHOFEX) spectra of N₂O⁺ via B²П_i←X²Π transitions was obtained over the wavelength range from 230 to 275 nm by preparing N₂O⁺(X²Π(000)) ions via [3+1] resonance enhanced multiphoton ionization of N₂O molecules at 360.50 nm. On the basis of the approximation of harmonic oscillation between N and NO or between N₂ and O, the Franck-Condon factors for the B²П_i(00n)←X²Π(000) transitions of N₂O⁺ ions were calculated using the potential curves and wavefunctions of the harmonic oscillator. The results of such calculations were compared with the photodissociation spectra of the B²П_i(00n)←X²Π(000) transition so as to estimate the validity of the rotational constants and the bond length of the B²П_i state obtained from previous studies. The photodissociation mechanism of the B²П_i(00n)←X²Π(000) transitions of N₂O⁺ ions and the product branching ratios were also discussed.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

N₂O⁺经由B²П_i←X²П跃迁的光解离机理研究

English

Study on the Photodissociation Mechanism of N₂O⁺ via B²П_i←X²П Transitions

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