Editors' selection of papers from China's academic journals
Xiang Robert Li
Ultracold Fermi gases provide versatile and flexible settings for molecular interactions and reaction dynamics in quantum regimes. Recently, Lianghui Huang and colleagues created weakly bound Feshbach molecules from the two spin components of 40K atomic Fermi gas. They then investigated the radio-frequency (RF) spectra of the weakly bound molecules and from that obtained the magnetic-field-dependent binding energy. The RF dissociation spectroscopy of the weakly bound molecules could be used to study ultracold molecule–molecule and molecule–atom collisions in the presence or absence of spin–orbit coupling. [Chin Phys B, 2014; 23(1): 013402] Researchers Guanjun Wang and colleagues have constructed a new apparatus based on a collinear tandem time-of-flight mass spectrometer to measure infrared photodissociation spectroscopy of size-selected ions in the gas phase. A simple new assembly, integrated with a mass gate and deceleration and reacceleration ion optics, was designed to fulfill mass selection, infrared photodissociation and fragment and parent ion mass analysis. Such an experimental setup provides a powerful tool to measure the infrared spectra of size-selected ions in the gas phase with high sensitivity. [Sci China Chem, 2013; 56(10): 1–6] Schematic diagram of the experimental apparatus consisting of a laser vaporization supersonic ion source and a collinear tandem time-of-flight mass spectrometer for infrared photodissociation spectroscopy. Published in Sci China-Chem, 2013; 56(10): 1–6. Gravitational potential energy sources and sinks, associated with different oceanic model parameterizations, can be used as criteria in evaluating the performance of a model. The upper bound of energy associated with lateral diffusion or advection is estimated at 100 GW. Any parameterizations associated with energy larger than the bound energy are unphysical. Further, any energy sources resulting from cabbeling associated with lateral advection in the Eulerian coordinate are artificial. In particular, huge sources or sinks in the widely used sigma-coordinated models imply the unphysical nature of such parameterization. [Acta Oceanol Sin, 2014; 33(3): 1–18] Graphene, composed of a single sheet of carbon atoms, has the potential for use in numerous exciting applications. Realizing its potential, however, requires sophisticated large-scale fabrication techniques that do not leave any residue on the graphene surface. By incorporating a protective metal layer into the standard photolithographic process, Johnson et al. have fabricated large-scale arrays of chemical vapor sensors. Specifically, the arrays are based on graphene field-effect transistors that are functionalized with DNA. These chemically functionalized graphene transistors act as a highly sensitive ‘electronic nose’, capable of detecting organic compounds at very low levels (parts per billion). [Nano Res, 2014; 7(1): 95–103]
National Science Review•Jun 1, 2014•0 citations