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It is described as a decrease in shielding effort between the nucleus and last orbital due to electrons present between them i.e., greater the screening effect, easier the removal of electron. In solids, especially in metals and semiconductors, the electrostatic screening or screening effect reduces the electrostatic field and Coulomb potential of an ion inside the solid. Like the electric field of the nucleus is reduced inside an atom or ion due to the shielding effect, the electric fields of ions in conducting solids are further reduced by the cloud of conduction electrons. The screened Coulomb potential is expressed as where Z is the atomic number, e is the elementary unit charge, r is the distance to the nucleus of the embedded ion, and q is the screening parameter that determines the range of the potential. The screening parameter q plays an important role in theoretical models in solid-state physics. The screened electrostatic potential, like the Yukawa potential, has a simple Fourier transform, expressed as The screened potential determines the inter atomic force and the phonon dispersion relation in metals.
Micro-chromatographic column for light hydrocarbon separation and method of making same
ActiveCN116651136BDecorative surface effectsDispersed particle separationStationary phaseScreening effect
The application provides a micro chromatographic column for light hydrocarbon separation and a preparation method thereof, and the micro chromatographic column is prepared from FG and HKUST-1 to obtain FG-HKUST-1 stationary phase, and the FG-HKUST-1 stationary phase is non-polar material; in addition to having a screening effect on C1-C4 light hydrocarbon, further, there is a dispersion force between the non-polar FG-HKUST-1 stationary phase and non-polar light hydrocarbon, such as non-polar methane and ethane, so that the non-polar FG-HKUST-1 stationary phase has strong retention capacity for non-polar light hydrocarbon, thereby the resolution of C1-C4 light hydrocarbon can be improved, especially for light hydrocarbon with low resolution, large concentration difference and similar properties, such as methane and ethane, so that the application can meet the requirements of qualitative and quantitative analysis and detection of light hydrocarbon.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Ion processing method and device of collision pool device, collision pool device, storage medium and computer program product
PendingCN121617891ATime-of-flight spectrometersElectron/ion optical arrangementsScreening effectCurrent voltage
The invention relates to an ion processing method and device of a collision pool device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: under the condition that ions are detected to enter a collision pool device, controlling the ions to be enriched on an axis in the collision pool device; based on the traveling wave driving force and the airflow dragging force on the axis, cooperatively screening out target ions from the ions; controlling the target ions to collide and crack with the collision gas to obtain daughter ions of the target ions; when it is detected that the daughter ions move to an axial bound electric field in the collision pool device in the axial direction, the daughter ions are bound through the axial bound electric field; the axial bound electric field is constructed through reverse direct-current voltage; the axial bound electric field is controlled to release daughter ions through the first alternating voltage, and the released daughter ions are led out of the collision pool device. By adopting the method, the enrichment effect, the screening effect, the separation effect and the extraction effect of ions can be improved.
Owner:GUANGZHOU HEXIN INSTR CO LTD