Violation of the adiabatic approximation observed in vibrational structures of a molecular ion at the photoionization

在光电离时分子离子的振动结构中观察到的绝热近似的违反

• 批准号: 15350018
• 负责人: SUZUKI Isao H.
• 金额: $ 9.47万
• 依托单位: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15350018/
• 关键词: Electron-ion multi-coincidence detection; Momentum imaging; Inner-shell photoionization; Shape resonance; Ultra-fast time detection; Small molecule; Vibrational structure; Molecular beam; 内殻励起; 内殻イオン化; 二酸化炭素

We have developed a multiple electron-ion-coincidence momentum imaging apparatus with high momentum resolution using monochromatized undulator radiation at SPring-8, in order to study K-shell photoelectron angular distribution(PAD) in the molecular frame. This apparatus consists of electron and ion time-of-flight spectrometers with multi-hit two-dimensional position sensitive detectors, a supersonic jet of samples, and a fast TDC system, which is composed of 12 bits/100 MHz crystal oscillator counters and 7 time-to-amplitude converters and can receive signals up to 6 as start pulses and one signal as a stop signal. The time resolution of this TDC is about 120 ps under the time spam of 40 μs. Using this apparatus we have measured vibration-resolved photoelectron angular distributions of molecules in the molecular frame and clarified the vibration-resolved O 1s PADs from CO_2 in the O 1s→5σ_g^* shape resonance region. The PADs are compared with the theoretical calculation using a partial … More ly relaxed Hartree-Fock approximation, which elucidated a role of partial wave components in the anti-symmetric-stretching vibrational mode signals for photoelectron emission. Then, we have measured vibration- and multiplet-resolved N 1s PADs from NO in the N 1s→σ^* shape resonance region. There are two maxima in the N 1s ionization region of NO, around 413 and 415 eV, which were interpreted as σ^* shape resonance, shake up, shake off, or exchange splitting. It has been found very interesting to compare the PADs around the two maxima each other, which are giving fruitful information on electron emission mechanisms from the K-shell of small molecules. Further this apparatus has served for clarification of molecular deformation just before ionic decomposition following K-shell excitation and/or ionization in small molecules like CO_2,C_2H_2 and NO_2.In conclusion, we have developed the multi-coincidence momentum imaging apparatus for obtaining the photoelectron angular distributions with vibrational resolution in the molecular frame and clarified detailed mechanisms of photoelectron emission processes in the K-shell electrons of small molecules. Less

为了研究分子系中K壳层光电子角分布（PAD），我们在SPring-8上研制了一台具有高动量分辨率的多电子-离子符合动量成像装置。该装置由电子和离子飞行时间谱仪与多击中二维位置敏感探测器，样品的超音速射流，和快速TDC系统，它是由12位/100 MHz的晶体振荡器计数器和7个时间-幅度转换器，并可以接收信号多达6个作为启动脉冲和一个信号作为停止信号。在40 μs的时间脉冲下，TDC的时间分辨率约为120 ps。用该装置测量了分子在分子框架中的振动分辨光电子角分布，并阐明了O 1 s →5σ_g^* 形共振区中CO_2的振动分辨O 1 sPAD。用偏微分方程的理论计算值与PAD值进行了比较。 ...更多信息 Ly松弛的Hartree-Fock近似，阐明了分波分量在光电子发射的反对称伸缩振动模式信号中的作用。然后，我们测量了NO在N1s →σ^* 形共振区的振动分辨和多重分辨N1sPAD。在NO的N1s电离区有两个最大值，分别位于413和415 eV附近，这可能是σ^* 型共振、振荡、脱落或交换分裂的结果。比较两个最大值附近的PAD非常有趣，这为小分子K壳层的电子发射机制提供了丰富的信息。此外，该装置还用于解释CO_2，C_2H_2和NO_2等小分子在K壳层激发和/或电离后离子分解前的分子形变。我们已经开发了多-利用符合动量成像装置获得了分子坐标系中具有振动分辨率的光电子角分布，阐明了K-小分子的壳层电子。少

项目成果

Nuclear dynamics of core-excited and ionized small polyatomic molecules probed by multiple coincidence momentum imaging technique

通过多重符合动量成像技术探测核心激发和电离小多原子分子的核动力学

• 发表时间: 2004
• 期刊: Physica Scripta T110
• 作者: Georg Pruemper;Norio Saito;Georg Pruemper;Georg Pruemper;Kiyoshi Ueda;Georg Pruemper;Georg Pruemper;Kiyoshi Ueda;Kiyoshi Ueda;G.Prumper;G.Prumper;G.Prumper;Alberto De Fanis;Norio Saito;Norio Saito;Norio Saito
• 通讯作者: Norio Saito

Asymmetric nuclear motion of the F 1s-ionized state in BF_3 probed by quadruple-ion-coincidence momentum imaging

四离子符合动量成像探测BF_3中F 1s电离态的不对称核运动

• 发表时间: 2004
• 期刊: Physical Review A 69
• 作者: Georg Pruemper;Norio Saito;Georg Pruemper;Georg Pruemper;Kiyoshi Ueda;Georg Pruemper;Georg Pruemper;Kiyoshi Ueda;Kiyoshi Ueda;G.Prumper;G.Prumper;G.Prumper;Alberto De Fanis
• 通讯作者: Alberto De Fanis

Vibration-and symmetry-resolved O 1s photoelectron angular distribution of CO_2 in the molecular frame

分子框架中CO_2的振动和对称分辨O 1s光电子角分布

• 期刊: Physical Review A (投稿中)
• 作者: 齋藤則生

Dynamics of core-ionization and excitation of molecules probed by multiple coincidence momentum imaging spectroscopy

• DOI: 10.1016/j.elspec.2005.01.011
• 发表时间: 2005-06
• 期刊: Journal of Electron Spectroscopy and Related Phenomena
• 影响因子: 1.9
• 作者: N. Saito;A. D. Fanis;I. Koyano;K. Ueda

Alberto De Fanis: "Asymmetric nuclear motion of the Fls-ionized state in BF_3 probed by quadruple-ion-coincidence momentum imaging"Physical Review A. 69・2. 022506 (2004)

Alberto De Fanis：“通过四离子重合动量成像探测 BF_3 中 Fls 电离态的不对称核运动”《物理评论》A. 69・2 (2004)。