- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Resonant inelastic scattering of two x-ray photons by a many-electron atom
摘要： A nonrelativistic variant of the quantum theory for the resonant inelastic-scattering process of two x-ray photons in the deep 1s-shell ionization threshold energy region of a free many-electron atom is established. A quantitative estimate for the magnitude of the observed differential cross section is given.
关键词： differential cross section,quantum theory,resonant inelastic scattering,many-electron atom,x-ray photons
更新于2025-09-04 15:30:14
-
Unruh-DeWitt detectors as mirrors: Dynamical reflectivity and Casimir effect
摘要： We demonstrate that the Unruh-DeWitt harmonic-oscillator detectors in (1 t 1) dimensions derivative-coupled with a massless scalar field can mimic the atom mirrors in free space. Without introducing the Dirichlet boundary condition to the field, the reflectivity of our detector or atom mirror is dynamically determined by the interaction of the detector’s internal oscillator and the field. When the oscillator-field coupling is strong, a broad frequency range of the quantum field can be mostly reflected by the detector mirror at late times. Constructing a cavity model with two such detector mirrors, we can see how the quantum field inside the cavity evolves from a continuous to a quasidiscrete spectrum which gives a negative Casimir energy density at late times. In our numerical calculations, the Casimir energy density in the cavity does not converge until the UV cutoff is sufficiently large, with which the two internal oscillators are always separable.
关键词： Unruh-DeWitt detectors,atom mirrors,Casimir effect,reflectivity,quantum field theory
更新于2025-09-04 15:30:14
-
Extended π-Conjugated Structures via Dehydrative C–C Coupling
摘要： We describe a methodology for the synthesis of extended aromatic structures through dehydrative C?C coupling from readily accessible diols. Treatment of the diols with a Br?nsted acid (para-toluenesulfonic acid) induces the nucleophilic addition of an arene or heteroarene, yielding fully aromatic products in high to quantitative yields with thiophenes, furan, indole, and N,N-dimethylaniline as coupling partners. The C?C coupling reactions proceed under mild, open flask conditions and offer high atom economy, while providing an attractive alternative approach to metal-catalyzed cross-coupling.
关键词： metal-catalyzed cross-coupling,extended aromatic structures,atom economy,para-toluenesulfonic acid,dehydrative C?C coupling,Br?nsted acid
更新于2025-09-04 15:30:14