Study on optically forbidden excited states by photodetachment threshold electron spectroscopy

光脱离阈值电子能谱研究光禁激发态

基本信息

批准号：
07454155
负责人：
ISHIWATA Takashi
金额：
$ 5.06万
依托单位：
Hiroshima City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

There are the excited states which are optically forbidden to access from the ground state due to several restrictions, such as the symmetrical selection rules and the spin conservation. This study aimed to find these excited states by photodetachment threshold electron spectroscopy, and to elucidate their nature in combining with other spectroscopic techniques.(1)Ion-pair states of molecular chlorine : The 0^+_(^3P_0) states inaccessible from the ground states due to the Franck-Condon restriction was identified by optical-optical double resonance through the B^3II(0^+_) state.The 0^-_(^3P_1) state was also accessed through the A^3II(1_u)-B'^3II(0^-_) interacting states by perturbation-facilitated optical double resonance. The potential functions of these excited states were determined.(2)Electronically excited states of NO _3 radical : The molecular constants of the ^2A_2 ground stats are determined from the infrared absorption band using the combination differences.The symmetrically … More forbidden excited state (^2E") was found in the infrared region. using the Zeeman modulation, the specturm was assigned as the parallel transition to the ^2A"_1 vibronic state in which the e" vibration broke the Born-oppenheimer approximation through the vibronic interaction in the excited state.(3)Electronically excited states of HOCl : When we photodissociate the HOCI radical which is important in the stratospheric ozone balance, the OH fragment showed its velocity to be aligned along the electronic vector of the photolysis light at 266 nm. The photoabsorption at this wavelength proceeds through 2^1A'-1^1A' transition whose transition moment is parallel to the O-Cl axis. On the other hand, in the photolysis at 355nm, the OH fragments were aligned perpendicular to the electronic vector of photolysis light, indicating that the 1^1A"-1^1A'transition occurred. Consequently, HOCl is photodissociated only through the singlet excited states, which is in contrast with the fact that the photodissociation can occur through a triplet state in the case of HOBr. Less

由于几个限制，例如对称选择规则和旋转保护，因此有些激发的状态被视为禁止从基态访问。这项研究的目的是通过光检查阈值电子光谱法找到这些激发态，并阐明它们与其他光谱技术结合的性质。（1）分子氯的离子-PAIR状态：0^+_（^3p_0）通过Franck-Condict condiction dowillictic nationditice doutive downical-downical-Condictical downique-downical-downical native-Condictice-Cone natiqual downique native-Condictical doutige b^3ii（0^+_）状态。还通过A^3II（1_U）-b'^3II（0^-_）通过扰动 - 扰动 - 触觉光学的光学双共振来访问0^-_（^3p_1）状态。 The potential functions of these excited states were determined.(2)Electronically excited states of NO _3 radical : The molecular constants of the ^2A_2 ground stats are determined from the infrared absorption band using the combination differences.The symmetrically … More forbidden excited state (^2E") was found in the infrared region. using the Zeeman modulation, the specturm was assigned as the parallel transition to the ^2A"_1 E“振动在令人兴奋的状态下的振动相互作用破坏了振动的振动状态。（3）HOCL的电子激发态：当我们在热电学上迁移HOCI自由基，这在平流层臭氧平衡中很重要时，OH的片段表明了其沿着光的速度沿着26的光效应，并沿着26的光效应效应。该波长通过2^1a'-1^1a'的跃迁进行，其过渡矩与O-CL轴平行。因此，仅通过单线激发态将HOCL与光电分离态，这与在HOBR的情况下可以通过三胞胎态进行光解离的事实形成鲜明对比。较少的