Using a Nd:YAG pumped pulsed dye laser-wavelength extender as UV light source, the multiphoton ionization of o CS was studied in a supersonic moecular beam with a Time of Flight mass spectrometer and a Magnetic Bottle...Using a Nd:YAG pumped pulsed dye laser-wavelength extender as UV light source, the multiphoton ionization of o CS was studied in a supersonic moecular beam with a Time of Flight mass spectrometer and a Magnetic Bottle Time of Flight photoelectron spectrometer. The intermediate resonant states of OCS were obtained from the massselected MPI spectra by scanning the laser wavelength. From 2+1 MPI photoelectron spectra at dmerent resonant wavelength the vibrational levels of OCS+ ion in electronic ground state X2 H3/2,1/2 were assigned and their X2II spin-orbital splitting was determined to be 0.046eV. The non Franck-Condon behavior between the Rydberg intermediate state and the ionic state has been discussed.展开更多
利用强场近似(Strong field approximation,SFA)方法研究氢负离子(H^-)在强激光场中双光子电离的能量谱,所得到的电离谱随角度的变化规律与实验结果符合得很好.进一步的研究表明,H^-离子在强激光场中双光子电离的能量谱与有质动力能有关...利用强场近似(Strong field approximation,SFA)方法研究氢负离子(H^-)在强激光场中双光子电离的能量谱,所得到的电离谱随角度的变化规律与实验结果符合得很好.进一步的研究表明,H^-离子在强激光场中双光子电离的能量谱与有质动力能有关.激光场强度越大,光电子的有质动力能也越大,能量谱向左移动越明显.我们的结果表明,使用强场近似是一种研究负离子在强激光场中电离过程的有效方法.展开更多
由于拥有―C(O)S―和―NCO基团,FC(O)SNCO的分子和电子结构是非常有趣的.利用FC(O)SCl和Ag NCO制备了FC(O)SNCO,并利用He I光电子能谱(PES)、光电离质谱(PIMS)以及理论计算研究了其分子和电子结构.通过将实验、理论计算以及自然键轨道(N...由于拥有―C(O)S―和―NCO基团,FC(O)SNCO的分子和电子结构是非常有趣的.利用FC(O)SCl和Ag NCO制备了FC(O)SNCO,并利用He I光电子能谱(PES)、光电离质谱(PIMS)以及理论计算研究了其分子和电子结构.通过将实验、理论计算以及自然键轨道(NBO)分析结合起来,获得了FC(O)SNCO的最稳定分子构型.利用外壳层格林函数(OVGF)方法以及与相似化合物的比较,对其光电子能谱进行了指认.理论计算表明,对于中性分子最稳定的构型为syn-syn非平面构型,而电离后的离子最稳定构型为syn-syn平面构型.实验结果表明,第一电离能来自于S的孤对电子轨道,为10.33 e V.第二至第六电离能分别为12.03、13.23、13.77、14.78、15.99 e V,并对这些电离能进行了指认.在光电离质谱中产生了六个质谱峰,分别为SN+、FC(O)+、SNCO+、FC(O)SN+、C(O)SNCO+、FC(O)SNCO+,其中FC(O)SNCO+的峰是最强峰.结合HeI光电子能谱和理论计算,对PIMS进行了分析,并研究了可能的电离和解离过程并对其进行了讨论.展开更多
The TOF-mass spectra of CS2+、CS+、 and C+ ions were obtained by the methodof REMPI. The mechanism of the production of these ions was discussed according to the mass spectra. The structures observed from the mass spe...The TOF-mass spectra of CS2+、CS+、 and C+ ions were obtained by the methodof REMPI. The mechanism of the production of these ions was discussed according to the mass spectra. The structures observed from the mass spectrum were assigned.展开更多
文摘Using a Nd:YAG pumped pulsed dye laser-wavelength extender as UV light source, the multiphoton ionization of o CS was studied in a supersonic moecular beam with a Time of Flight mass spectrometer and a Magnetic Bottle Time of Flight photoelectron spectrometer. The intermediate resonant states of OCS were obtained from the massselected MPI spectra by scanning the laser wavelength. From 2+1 MPI photoelectron spectra at dmerent resonant wavelength the vibrational levels of OCS+ ion in electronic ground state X2 H3/2,1/2 were assigned and their X2II spin-orbital splitting was determined to be 0.046eV. The non Franck-Condon behavior between the Rydberg intermediate state and the ionic state has been discussed.
文摘利用强场近似(Strong field approximation,SFA)方法研究氢负离子(H^-)在强激光场中双光子电离的能量谱,所得到的电离谱随角度的变化规律与实验结果符合得很好.进一步的研究表明,H^-离子在强激光场中双光子电离的能量谱与有质动力能有关.激光场强度越大,光电子的有质动力能也越大,能量谱向左移动越明显.我们的结果表明,使用强场近似是一种研究负离子在强激光场中电离过程的有效方法.
基金supported by the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(XDB05010400)National NaturalScience Foundation of China(41105085,21073051)Natural Science Foundation of Hebei Province,China(B2010000368)~~
文摘由于拥有―C(O)S―和―NCO基团,FC(O)SNCO的分子和电子结构是非常有趣的.利用FC(O)SCl和Ag NCO制备了FC(O)SNCO,并利用He I光电子能谱(PES)、光电离质谱(PIMS)以及理论计算研究了其分子和电子结构.通过将实验、理论计算以及自然键轨道(NBO)分析结合起来,获得了FC(O)SNCO的最稳定分子构型.利用外壳层格林函数(OVGF)方法以及与相似化合物的比较,对其光电子能谱进行了指认.理论计算表明,对于中性分子最稳定的构型为syn-syn非平面构型,而电离后的离子最稳定构型为syn-syn平面构型.实验结果表明,第一电离能来自于S的孤对电子轨道,为10.33 e V.第二至第六电离能分别为12.03、13.23、13.77、14.78、15.99 e V,并对这些电离能进行了指认.在光电离质谱中产生了六个质谱峰,分别为SN+、FC(O)+、SNCO+、FC(O)SN+、C(O)SNCO+、FC(O)SNCO+,其中FC(O)SNCO+的峰是最强峰.结合HeI光电子能谱和理论计算,对PIMS进行了分析,并研究了可能的电离和解离过程并对其进行了讨论.
文摘The TOF-mass spectra of CS2+、CS+、 and C+ ions were obtained by the methodof REMPI. The mechanism of the production of these ions was discussed according to the mass spectra. The structures observed from the mass spectrum were assigned.
