Site-specific photochemistry following soft x-ray irradiation

软 X 射线照射后的位点特异性光化学

• 批准号: 61470018
• 负责人: TANAKA Kenichiro
• 金额: $ 3.2万
• 依托单位: National Laboratory for High Energy Physics
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61470018/
• 关键词: Photochemistry; Core excitation; Threshold electron; Auger electron

Soft x ray absorption in a molecule involving ionization of a core electron usually results in a fragmentation of molecule. The fragmentation has often been observed to occur specifically around the site of the atom where the core electron excitation takes place. Based on these observations one might consider the use of tunable soft x rays to stimulate chemical reactions or to selectively break large organic molecules, as one pleases.From this point of view, in this project we have designed and constructed a new experimental apparatus involving an Auger electron analyser, a threshold electron analyser, and a mass spectrometer to elucidate the full mechanism of a soft x ray photochemistry of the adsorbed molecules on the surfaces. Using this apparatus, we have succeeded in detecting both Auger electrons and ionic products of photo-stimulated desorption in a oxygen/Cu system. We have also found that the fragmentation pattern following soft x ray irradiation changes whether the exctation energy is lower or higher than the ionization limit of a core electron.

涉及核心电子电离的分子中的软X射线吸收通常会导致分子碎片化。经常观察到碎片是在发生核心电子激发的原子位点周围特别发生的。基于这些观察结果，人们可能会考虑使用可调软X射线来刺激化学反应或选择性地打破大型有机分子，从而使这个项目从这个观点开始，在这个项目中，我们已经设计并构建了一种涉及一个新的实验设备，涉及一个新的实验设备螺旋电子分析仪，阈值电子分析仪和质谱仪，以阐明表面上吸附分子的软X射线光化学的完整机制。使用此设备，我们成功地检测了氧气/CU系统中光刺激解吸的螺旋钻电子和离子产物。我们还发现，软x射线照射后的碎裂模式是否会改变过气能量低于或高于核心电子的电离极限。

项目成果

H.Koizumi;K.Hironaka;K.shinsaka;S.Arai;H.Nakazawa;A.Kimura;Y.Hatano;Y.Ito;Y Zhang;A.Yagashitaa;K.Ito;K.Tanaka: Journal of Chemical Physies. 85. 4276-4279 (1986)

H.Koizumi;K.Hironaka;K.shinsaka;S.Arai;H.Nakazawa;A.Kimura;Y.Hatano;Y.Ito;Y 张;A.Yagashitaa;K.Ito;K.Tanaka：化学杂志

Shin Arai: Journal of Chemical Physics. 88. (1988)

Shin Arai：化学物理学杂志。

Hitoshi Koizumi: Radiation Physics and Chemistry. 32. 111-115 (1988)

小泉仁：放射物理与化学。

Shin Arai et al.: "Lyman <alpha>, Lyman <alpha> coincidence detection inthe photodissociation of doubly excited molecular hydrogen into two H(2P) atoms." Journal of Chemical Physics. 88. (1988)

Shin Arai 等人：“双激发分子氢光解成两个 H(2P) 原子中的莱曼 <α>、莱曼 <α> 符合检测。”

Kenichiro Tanaka: Science Forum. Application techniques of synchrotron radiation. (Japanese), (1988)

田中健一郎：科学论坛。