Spectroscopic study of N2O+(A 2Σ+) by photofragment excitation spectrum

Abstract

Photofragment NO ϩ excitation spectrum of N 2 O ϩ ions has been studied in the wavelength range of 278-328 nm, where the parent N 2 O ϩ ions were state-selectively prepared at the X 2 ⌸ 1/2,3/2 (000) levels by ͓3ϩ1͔ multi-photon ionization of jet-cooled N 2 O molecules at 360.55 nm. The spectrum was attributed completely to the A 2 ⌺ ϩ ←X 2 ⌸ 3/2,1/2 (000) electronic transition of N 2 O ϩ. Totally 47 vibronic bands associated to 24 vibrational levels of the A 2 ⌺ ϩ state were identified in the present work, most of which were observed for the first time. The sufficient spectroscopic data made it possible to investigate the Fermi-resonance between the 1 and 2 vibrational modes at the A 2 ⌺ ϩ state. Based on the assignment, the spectral constants of the A 2 ⌺ ϩ state, such as vibrational frequencies, anharmonic constants, and Fermi interaction constant, were determined with relatively high reliability and precision.

A threshold photoelectron-photoion coincidence spectrometer with double velocity imaging using synchrotron radiation

“…Through the TPES experiments, the IEs of molecules can be directly determined, and more information like molecular structures and vibrational frequencies of cations can be obtained subsequently, which seems much more convenient and effective than that of using pulsed lasers. [57][58][59] ͑b͒ TPEPICO spectroscopy of molecules can be recorded.…”

Excitation Spectra and Photodissociation Dynamics of the <em>B</em>²<em>П</em> State of the N₂O⁺ Ion

“…离子-分子反应(O + +N2→NO + +N)是大气电离层 中的一个重要化学反应. [1][2][3][4] 作为反应中间物, N2O + 分 子离子在其反应机理中扮演着重要角色, 引起人们 长期关注, 采用多种实验光谱技术开展了 N2O + 分子 离子的诸多研究, 例如: 光吸收, 4,5 共振增强多光子 电离(REMPI), [6][7][8] He-I 光电子能谱, [9][10][11][12] 场致电离光电 子谱, [13][14][15] 光电子-光离子符合技术, 16 阈值光电子-光 离子符合, [17][18][19][20][21] 光致碎片激发(PHOFEX)谱 [22][23][24][25][26][27] 等.…”

“…中性 N2O 分子具有典型的非对称线性几何结 构, 其 电 子 基 态 为 (1σ) 2 (2σ) 2 (3σ) 2 (4σ) 2 (5σ) 2 (6σ) 2 (1π) 4 (7σ) 2 (2π) 4 , 当分子外壳层中的电子被电离后, 会产生 各种电子态的 N2O + 离子, 例如去掉 2π、 7σ、 1π和 6σ壳 层轨道中的一个电子后会依次形成 X 2 Π、 A 2 Σ + 、 B 2 Π 和 C 2 Σ + 电子态的 N2O + 离子. 28,29 近年来, 人们对 N2O + 离子 A 2 Σ + 电子态的光谱结构做了详细的分析和标 识. Xu 等 24,27 相对于以往对 X 2 Π和 A 2 Σ + 电子态的光谱研究, B 2 Π态的光谱研究则较缺乏. 早期的 N2O 分子的光 电子谱中, B 2 Π态显示出复杂的光谱结构, 9,13,14 即在 宽包络背景上叠加很多不规则的振动结构, 相应的 标识也模糊不清.…”