吴 军,吴庆春,涂宏庆,崔云康,唐春红
(1. 南京工程学院数理部非线性物理研究所,南京 211167; 2. 南京大学物理系固体微结构物理国家重点实验室,南京 210093)
磷基的几何结构与光电子能谱
吴 军1,2,吴庆春1,涂宏庆1,崔云康1,唐春红1
(1. 南京工程学院数理部非线性物理研究所,南京 211167; 2. 南京大学物理系固体微结构物理国家重点实验室,南京 210093)
Franck-Condon分析; Duschinsky效应; 光谱模拟; 从头算/密度泛函
Franck-Condon分析中,由于分子振动跃迁的两个电子态的构型、力常数甚至对称性都可能发生变化,因而存在由构型变化引起的“模式混合”或称“Duschinsky 效应”[11],两个电子态之间的简正坐标可以写成Q′=JQ+K.在Born-Oppenheimer近似和谐振子模型下,“Duschinsky效应”的处理采用Peter Chen的笛卡尔位移坐标变换方法[12],其中正交矩阵J和位移矢量K在ab initio/DFT下的表示式:
(1)
(2)
其中M是以原子质量作为对角元的3N×3N矩阵,g03是一个3N×3N-6矩阵,含有来自Gaussian03程序输出的简正模,V是一个以每个模的约化质量作为它的对角元3N-6×3N-6对角距阵,Z对大多数对称类为C2v或更高对称性的分子来说是单位矩阵,R=ZReq-Req′是分子质心笛卡尔坐标系中末态与初态分子平衡位置的几何变化.式中加撇和不加撇的分别表示所研究分子的初态和末态.
3.1 几何优化和频率计算
MethodR(PH)(nm)Ð(HPH)(o)ω1(a1)ω2(a1)ω3(b2)B3LYP/6-311+G(2d,p)0 142391 72360 78651130 90742367 8721B3LYP/aug⁃cc⁃pVTZ0 1425491 87992358 73081122 89632367 9207MP2/6-311+G(2d,p)0 1410692 30922477 14111173 49682483 0878MP2/aug⁃cc⁃pVTZ0 1415591 95932454 99491141 90022466 4543CCSD/6-311+G(2d,p)0 1415992 16092422 06011168 17502423 7649Experiment0 1423a91 7a2295±15b,2310±2c1102d
aRef.[19],bRef.[9],cRef.[20],dRef.[21]
MethodR(PH)(nm)Ð(HPH)(°)ω1(a1)ω2(a1)ω3(b2)B3LYP/6-311G+(2d,p)0 1433792 09292256 52291092 13282259 6551B3LYP/aug⁃cc⁃pVTZ0 1435592 26262258 66111082 62912262 8940MP2/6-311+G(2d,p)0 1421392 46222379 53371129 86122382 0911MP2/aug⁃cc⁃pVTZ0 1427592 11792354 17661089 69502360 4211CCSD/6-311+G(2d,p)0 142692 44012325 90091131 97872328 7484FromRef.90 143992 31060eIFCA(thiswork)0 1438±0 000292 2±0 2
eRef.[22]
3.2 光谱模拟和迭代Franck-Condon分析
Q1Q2Q3Q′10 98590 00740Q′2-0 02111 00160Q′3000 9958
ΔQ1ΔQ2ΔQ30 0087-0 02140
图1 实验观测到的的光电子能谱[9]Fig. 1 f.9). The region including the symmetric stretch and bending transitions is multiplied by a factor of 50 and offset from the lower axis
图2 理论模拟得到的的光电子能谱Fig. 2 The simulated spectrum invoking the experimental geometry given in Ref.. The FWHM used for the components of the simulated spectra is 230 cm-1
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Photoelectron spectra and geometric structures of phosphino radical
WU Jun1,2,WU Qing-Chun1,TU Hong-Qing1,CUI Yun-Kang1,TANG Chun-Hong1
(1. Institute of Nonlinear Physics,Department of Mathematics and Physics,Nanjing Institute of Technology,Nanjing 211167,China;2. National Laboratory of Solid State Microstructures,Department of Physics,Nanjing University,Nanjing 210093, China)
Franck-Condon analysis; Duschinsky effect; Spectral simulation; Ab initio/DFT
国家自然科学基金(51472113,21403144 );江苏省高校自然科学基础研究项目(12KJB510004);南京工程学院科研基金项目(QKJB2011020,CKJA201207,ZKJ201204);江苏省自然科学基金(BK20141390);宁夏高校科研项目(NGY2013105)
吴军(1983—),男,博士生,讲师,主要从事原子与分子、团簇物理学研究. E-mail: wujun@njit.edu.cn
103969/j.issn.1000-0364.2015.08.002
O561
A
1000-0364(2015)08-0538-05
投稿日期: 2014-09-03