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Complex-forming reactions widely exist in gas-phase chemical reactions.Various complexforming bimolecular reactions have been investigated and interesting phenomena have been discovered.The complex-forming reactions usually have small or no barrier in the entrance channel, which leads to obvious differences in kinetic and dynamic characteristics compared with direct reactions.Theoretically, quantum state-resolved reaction dynamics can provide the most detailed microscopic dynamic mechanisms and is now feasible for a direct reaction with only one potential barrier.However, it is of great challenge to construct accurate potential energy surfaces and perform accurate quantum dynamics calculations for a complex polyatomic reaction involving deep potential wells and multi-channels.This paper reviews the most recent progress in two prototypical oxyhydrogen complex-forming reaction systems, HO2 and HO3, which are significant in combustion, atmospheric, and interstellar chemistry.We will present a brief survey of both computational and experimental work and emphasize on some unsolved problems existing in these systems. 相似文献
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Tao Li Hai-tao Zhou Zhong-hua Li Yun-fei Bai Yuan Li Jiang-rui Gao Jun-xiang Zhang 《Frontiers of Physics in China》2009,4(2):209-213
The transmission spectrum of four-level atoms in a cavity is calculated. It is shown that the four separate peaks associated
with normal mode splitting and intra-cavity double dark states can be observed simultaneously. The position and intensity
of the four peaks can be controlled by the intensity of the third interacting light. Therefore, the enhancement of normal
mode splitting by a third coupling light of the intra-cavity four-level atoms is developed.
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Novel conjugated polymers with aza-15-crown-5 as pendant groups, P1 were synthesized by the Sonogashira coupling reaction. The polymer P1 was found to show fluorescence en-hancement response towards Ba2+. The gradual recovery and turning-point of emission intensity of polymers appeared in the addition of Ba2+, which provided good evidence for the fluorescence amplification mechanism of conjugated polymers. 相似文献
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An interferometric detection scheme to measure optical phase shift with sensi tivity beyond the shot noise limit is proposed. The theoretical calculation shows that using the quantum correlated twin beams produced from an optical parametric amplifier as the input fields of a Mach-Zehnder interferometer, the minimum detectable phase shift will exceed the shot noise limit N-1/2 and approach the Heisenberg limit N-1. The parametric dependences of the minimum detectable phase shift on the nonlinear interaction, input photon number, and detection efficiency are shown. 相似文献
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研究带有Neumann边界条件的拟线性方程组的正解问题.在不同参数条件下,主要利用特征值理论和Nehari流形给出了方程组正解的存在性和多解性.这一结论很好的推广了已有的结果. 相似文献
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