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Electronic Transitions of C5H3+ and C5H3: Neon Matrix and CASPT2 Studies

机译:C5H3 +和C5H3的电子跃迁:氖矩阵和CASPT2研究

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摘要

Two absorption systems of C5H3+ starting at 350 and 345 nm were detected following mass-selective deposition of m/e = 63 ions in a 6 K neon matrix. These are assigned to the 1 (1)A(1) <- X (1)A(1) electronic transition of 1,2,3,4-pentatetraenylium H2CCCCCH+ (isomer B+) and 1 B-1(2) <- X (1)A(1) of penta-1,4-diyne-3-ylium HCCCHCCH+ (C+). The absorptions of neutral C5H3 isomers with onsets at 434.5, 398.3, 369.0, and 267.3 nm are also detected. The first two systems are assigned to the 1 B-2(1) <- X B-2(1) and 1 (2)A(2) <- X B-2(1) transitions of isomer B and C, respectively, and the latter two to ethynylcyclopropenyl (A) and 3-vinylidenecycloprop-1-enyl (D) radicals. The structural assignments are based on the adiabatic excitation energies calculated with the MS-CASPT2 method. A vibrational analysis of the electronic spectra, based on the calculated harmonic frequencies, supports this.
机译:在m / e = 63离子在6 K氖气基质中进行质量选择沉积后,检测到两个从350和345 nm开始的C5H3 +吸收系统。这些被分配给1,2,3,4-戊二烯基H2CCCCCH +(异构体B +)和1 B-1(2)<-的1(1)A(1)<-X(1)A(1)电子跃迁X(1)A(1)的penta-1,4-diyne-3-ylium HCCCHCCH +(C +)。还检测了起始于434.5、398.3、369.0和267.3 nm的中性C5H3异构体的吸收。前两个系统分别分配给异构体B和C的1 B-2(1)<-X B-2(1)和1(2)A(2)<-X B-2(1)过渡,后两个为乙炔基环丙烯基(A)和3-亚乙烯基环丙烯-1-基(D)。结构分配基于使用MS-CASPT2方法计算的绝热激发能。基于计算出的谐波频率对电子频谱进行振动分析可以证明这一点。

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