相关实验视频
Updated: Jan 16, 2026

06:53
Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
Published on: July 27, 2018
9.1K
来自Ar-NO复合体光解离的NO (A) 的速度图像成像
Bradley F Parsons1, Emerson Pappas1, Kylie Reardon1
1Department of Chemistry and Biochemistry, Creighton University, 2500 California Plaza, Omaha, Nebraska 68178, United States.
ACS omega
|September 29, 2025
概括
这项研究对氧化物 (Ar-NO) 复合体进行光解离,揭示了对激发性氧化物 (NO) 解离能和旋转动态的新见解. 这些发现完善了分子相互作用的理论模型.
科学领域:
- 化学物理 化学物理
- 分子动力学分子动力学
- 频谱学是一种光谱学.
背景情况:
- 了解Ar-NO复合体对于分子相互作用至关重要.
- 之前关于Ar-NO解离的研究对激发状态的洞察力有限.
研究的目的:
- 为了精确地确定Ar-NO复合体在基态和兴奋状态中的解离能.
- 为了研究氧化 (NO) 在光解离后的旋转状态分布和角异型性.
- 将实验结果与Ar-NO相互作用的理论预测进行比较.
主要方法:
- 通过 Ar-NO 复合物的光解离,通过一系列的能量.
- 对NO (A) 产品进行非共振电离,然后进行速度图形离子成像.
- 高分辨率检测以解决NO (A) 的单个旋转状态.
主要成果:
- 确定了NO (A) 形成的最小能量 (44294.3 ± 2.2 cm-1).
- 测量了基态解离能 (95.4 ± 2.2 cm−1) 和兴奋状态解离能 (52 ± 2 cm−1).
- 由于旋转彩虹效应,在NO (A) 中观察到双模旋转状态分布.
- 描述了角异构性参数 (β),并指出其对旋转状态和激发能量的依赖.
结论:
- 实验中的基态解离能与理论计算一致.
- 测量到的兴奋状态解离能量超过了理论预测,表明需要精制潜在能量表面.
- 观察到的角异构性为激发的Ar-NO复合物的解离动力学和几何学提供了洞察力.
相关概念视频
Nuclear Overhauser Enhancement (NOE)
1.4K
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
1.4K
UV–Vis Spectroscopy: Molecular Electronic Transitions
2.7K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
2.7K
IR Spectroscopy: Molecular Vibration Overview
4.5K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
4.5K
Atomic Emission Spectroscopy: Instrumentation
1.2K
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
1.2K
Atomic Emission Spectroscopy: Interference
597
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
597
Atomic Emission Spectroscopy: Overview
3.5K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
3.5K

