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氮化钒的选态双色可见紫外共振增强光电离和脉冲场光电子研究 (cited: 4)
黄璜,罗志弘,詹益忠,刘家聪,伍灼耀*
作者单位E-mail
黄璜 美国加州大学戴维斯分校化学系加州戴维斯95616  
罗志弘 美国加州大学戴维斯分校化学系加州戴维斯95616  
詹益忠 美国加州大学戴维斯分校化学系加州戴维斯95616  
刘家聪 香港城市大学生物与化学系香港九龙  
伍灼耀* 美国加州大学戴维斯分校化学系加州戴维斯95616 cyng@ucdavis.edu 
摘要:
对气态氮化钒(VN)分子在光子总能量为56900~59020 cm-13∏0, v'=0)的单转动态, 然后再被紫外激光电离.这样的双色激光模式可以测量电子态、振动态和转动态都被选择和解析的氮化钒阳离子VN+(X2△; v+=0, 1, 2)光谱. 通过对转动解析的PFI-PE光谱模拟分析, 确定J+=3/2为基态离子态的最低转动能级, 从而确认VN+的基态电子态为23/2.通过对VN+(PFI-PE)光谱的分析得到如下物理量的精确数值:VN+(X23/2)的绝热电离能为IE(VN)=56909.5±0.8 cm-1(7.05588±0.00010 eV),振动常数ωe+=1068.0±0.8 cm-1,反常振动常数ωe+χe+=5.8±0.8 cm-1;VN+(X23/2)的转动常数Be+=0.6563±0.0005 cm-1,αe+=0.0069±0.0004 cm-1,平衡键长为1.529 ?;VN+(X25/2)的转动常数Be+=0.6578±0.0028 cm-1,αe+=0.0085±0.0028 cm-1,平衡键长为1.527 ?;X25/2,3/2自旋轨道耦合常数A=153.3±0.8 cm-1
关键词:  氮化钒,氮化钒离子,光电离动力学,双色光电离,脉冲场 光电子,电离能,键解离能
DOI:10.1063/1674-0068/26/06/669-678
分类号:
基金项目:
State-to-state Photoionization Dynamics of Vanadium Nitride by Two-color Laser Photoionization and Photoelectron Methods (cited: 4)
Huang Huang,Zhi-hong Luo,Yih Chung Chang,Kai-Chung Lau,C. Y. Ng*
Abstract:
We have conducted a two-color visible-ultraviolet (VIS-UV) resonance-enhanced laser pho-toionization and pulsed field ionization-photoelectron (PFI-PE) study of gaseous vana-dium mononitride (VN) in the total energy range of 56900-59020 cm-1. The VN molecules were selectively excited to single rotational levels of the intermediate VN(D3∏0, v'=0) state by using a VIS dye laser prior to photoionization by employing a UV laser. This two-color scheme allows the measurements of rovibronically selected and re-solved PFI-PE spectra for the VN+(X2△; v+=0, 1, and 2) ion vibrational bands. By simulating the rotationally resolved PFI-PE spectra, J+=3/2 is determined to be the lowest rotational level of the ground electronic state, indicating that the symmetry of the ground VN+ electronic state is 23/2. The analysis of the PFI-PE spectra for VN+ also yields accurate values for the adiabatic ionization energy for the formation of VVN+(X23/2), IE(VN)=56909.5±0.8 cm-1 (7.05588±0.00010 eV), the vibrational fre-quency ωe+=1068.0±0.8 cm-1, the anharmonicity constant ωe+χe+=5.8±0.8 cm-1, the ro-tational constants Be+=0.6563±0.0005 cm-1 and αe+=0.0069±0.0004 cm-1, and the equi-librium bond length, re+=1.529 ?, for VN+(X23/2); along with the rotational constants Be+=0.6578±0.0028 cm-1 and αe+=0.0085±0.0028 cm-1, and the equilibrium bond length re+=1.527 ? for VN+(X25/2), and the spin-orbit coupling constant A=153.3±0.8 cm-1 for VN+(X25/2,3/2). The highly precise energetic and spectroscopic data obtained in the present study are valuable for benchmarking the predictions based on state-of-the-art ab initio quantum calculations.
Key words:  Vanadium nitride, Vanadium nitride cation, Photoionization dynamics, Two-color photoionization, Pulsed field ionization-photoelectron, Ionization energy, Bond disso-ciation energy