scholarly journals New hydrogen atom model and radiation absorption mechanism

2021 ◽  
Author(s):  
Xiaoen Wang
Keyword(s):  
Hydrogen Atom ◽  
Lorentz Force ◽  
Rotation Frequency ◽  
Coulomb Force ◽  
Photon Absorption ◽  
Radiation Absorption ◽  
Planck Constant ◽  
Absorption Mechanism ◽  
Wave Condition ◽  
Combined Action

Abstract Only Coulomb force is considered in Bohr model. It is found that electron in ground state hydrogen atom is also affected by Lorentz force of the same magnitude. Under the combined action of Coulomb force and Lorentz force, the radius of hydrogen atom is twice that of Bohr, and the rotation frequency of electron is half that of Bohr. The "half frequency" problem of Bohr's theory is solved, and the quantization result of the energy level of hydrogen atom is obtained by using the standing wave condition of quantum mechanics. The mechanism and details of photon absorption by hydrogen atom are analyzed and explained, and the physical meaning of Planck constant is explained.

scholarly journals New hydrogen atom model and radiation absorption mechanism

2021 ◽  
Author(s):  
Xiao En Wang
Keyword(s):  
Hydrogen Atom ◽  
Lorentz Force ◽  
Rotation Frequency ◽  
Coulomb Force ◽  
Photon Absorption ◽  
Radiation Absorption ◽  
Planck Constant ◽  
Absorption Mechanism ◽  
Wave Condition ◽  
Combined Action

Abstract Only Coulomb force is considered in Bohr model. It is found that electron in ground state hydrogen atom is also affected by Lorentz force of the same magnitude. Under the combined action of Coulomb force and Lorentz force, the radius of hydrogen atom is twice that of Bohr, and the rotation frequency of electron is half that of Bohr. The "half frequency" problem of Bohr's theory is solved, and the quantization result of the energy level of hydrogen atom is obtained by using the standing wave condition of quantum mechanics. The mechanism and details of photon absorption by hydrogen atom are analyzed and explained, and the physical meaning of Planck constant is explained.

scholarly journals Photoluminescence upconversion atGaAs/InGaP2interfaces driven by a sequential two-photon absorption mechanism

2016 ◽  
Vol 93 (23) ◽  
Author(s):  
N. P. Hylton ◽  
T. F. Hinrichsen ◽  
A. R. Vaquero-Stainer ◽  
M. Yoshida ◽  
A. Pusch ◽  
...  
Keyword(s):  
Photon Absorption ◽  
Absorption Mechanism ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals Polyfluorenylacetylene for near-infrared laser protection: polymer synthesis, optical limiting mechanism and relationship between molecular structure and properties

RSC Advances ◽  
2017 ◽  
Vol 7 (85) ◽  
pp. 53785-53796 ◽  
Author(s):  
Gang Zhao ◽  
Yan Feng ◽  
Shanyi Guang ◽  
Hongyao Xu ◽  
Naibo Lin ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Near Infrared ◽  
Optical Limiting ◽  
High Thermal Stability ◽  
Photon Absorption ◽  
Structure And Properties ◽  
Absorption Mechanism ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Good Solubility

The incorporation of styryl/stilbene–fluorene into polyacetylenes not only endowed the polymers with novel near-infrared optical limiting properties based on a two-photon absorption mechanism but good solubility and high thermal stability.

scholarly journals Site-selective redox isomerizations of furanosides using a combined arylboronic acid/photoredox catalyst system

2020 ◽  
Vol 11 (6) ◽  
pp. 1531-1537 ◽  
Author(s):  
Victoria Dimakos ◽  
Daniel Gorelik ◽  
Hsin Y. Su ◽  
Graham E. Garrett ◽  
Gregory Hughes ◽  
...  
Keyword(s):  
Hydrogen Atom ◽  
Ribonucleotide Reductase ◽  
Boronic Acid ◽  
Catalyst System ◽  
Hydrogen Atom Transfer ◽  
Synthetic Analog ◽  
Arylboronic Acid ◽  
System P ◽  
Combined Action ◽  
Site Selective

The combined action of boronic acid, photoredox catalyst and hydrogen atom transfer mediator enables the transformation of furanosides to 2-keto-3-deoxyfuranosides, a synthetic analog of the process catalyzed by the ribonucleotide reductase enzymes.

The Electrolytic Actuator-An Effect Dominated by Dissipative Currents

2009 ◽  
Vol 289-292 ◽  
pp. 311-317
Author(s):  
Hubert Temmen ◽  
Paola Caracciolo
Keyword(s):  
Electromagnetic Field ◽  
Simple Model ◽  
Lorentz Force ◽  
Thermodynamic Equilibrium ◽  
Ionic Currents ◽  
Coulomb Force ◽  
Macroscopic Description

For a conductive, elastic matter in thermodynamic equilibrium the LORENTZ force, which includes the COULOMB force for charged systems, is the only macroscopic interaction between the electromagnetic field and the matter. If irreversible currents such as diffusion and ionic currents are observed, these currents and their coupling can dominate the behaviour. Then, to describe that system it is necessary to start with a macroscopic description, which remains valid outside of the equilibrium. A macroscopic description of these currents is used to deduce a very simple model for an electrolytic actuator.

scholarly journals Elucidating the Nature of the Fine Structure Constant and Indicating the Existence of an Unknown Angular Momentum

2017 ◽  
Vol 9 (4) ◽  
pp. 17
Author(s):  
Koshun Suto
Keyword(s):  
Angular Momentum ◽  
Fine Structure ◽  
Hydrogen Atom ◽  
Structure Constant ◽  
Physical Constant ◽  
Natural World ◽  
Fine Structure Constant ◽  
Relativistic Energy ◽  
Planck Constant ◽  
Virtual Particle

In this paper, the author searches for a formula different from the existing formula in order to elucidate the nature of the fine structure constant a. The relativistic energy of the electron in a hydrogen atom is expressed as E_re,n and the momentum corresponding to that energy is taken to be P_re,n. Also, P_p,n is assumed to be the momentum of a photon emitted when an electron that has been stationary in free space transitions to the inside of a hydrogen atom. When n=1, the ratio of P_re,1 and P_p,1 matches with a. That is, P_p,1/Pre,1=a Also, the formula for the energy of a photon is E=hv. However, this formula has no constant of proportionality. If one wishes to claim that the energy of a photon varies in proportion to the photon's frequency, then a formula containing a constant of proportionality is necessary. Thus, this paper predicts that, in the natural world, there is a minimum unit of angular momentum h_vp smaller than the Planck constant. (The vp in h_vp stands for “virtual particle.”)If this physical constant is introduced, then the formula for the energy of the photon can be written as E=h_vp v/a. If h_vp exists, a formula can also be obtained which helps to elucidate the nature of the fine structure constant.

Infrared to Visible Upconversion Luminescence in Yb3+, Ho3+: Y2O3 Nanocrystalline Powders

2005 ◽  
Vol 492-493 ◽  
pp. 95-100 ◽  
Author(s):  
Jian Zhang ◽  
Shi Wei Wang ◽  
Li Qiong An ◽  
Min Liu ◽  
Li Dong Chen
Keyword(s):  
Diode Laser ◽  
Near Infrared ◽  
Continuous Wave ◽  
Upconversion Luminescence ◽  
Green Emission ◽  
Photon Absorption ◽  
Nanocrystalline Powders ◽  
Precipitation Method ◽  
Absorption Mechanism ◽  
Red Emission

Yb3+, Ho3+ co-doped Y2O3 nanocrystalline powders were synthesized via a reverse-strike co-precipitation method using nitrates and ammonia as raw materials. The as-prepared powders are cubic Y2O3 after fired at 7000C for 2 h. Field emission scanning electronic microscopy revealed that most of the particles are nearly spherical and the average diameter of the particles is in the range of 60-80 nm. Under the excitation with a 980 nm continuous wave diode laser, two main emission bands, i.e., green emission centered at 549 nm and red emission centered at 666 nm is observed, respectively. The green emission is attributed to the transition of (5S2, 5F4-5I8) levels of Ho3+; while for the red emission, the transition of 5F5-5I8 levels is suggested. In addition, near infrared emission centered at 755 nm is also detected, corresponding to the transition of (5S2, 5F4-5I7) levels. The dependence of the intensity of upconversion emissions upon the pump power of the diode laser suggests that two-photon absorption mechanism be involved in these processes.

scholarly journals Active glasses as the luminescent sources of radiation for sensor applications

2014 ◽  
Vol 62 (2) ◽  
pp. 393-397
Author(s):  
J. Żmojda ◽  
D. Dorosz ◽  
M. Kochanowicz ◽  
J. Dorosz
Keyword(s):  
Energy Transfer ◽  
Optical Fiber ◽  
Upconversion Luminescence ◽  
Spectroscopic Properties ◽  
Photon Absorption ◽  
Pump Radiation ◽  
Absorption Mechanism ◽  
Sensor Applications ◽  
Doped Glasses ◽  
Co Doped

Abstract The article presents physicochemical, thermal and spectroscopic properties of two different glass systems: TeO2-GeO2-PbO-PbF2- BaO-Nb2O5-LaF3 and SiO2-Al2O3-Sb2O3, co-doped with Yb3+/Tm3+ ions. Blue upconversion luminescence at a wavelength of 478 nm corresponding to the thulium 1G4 ⇥3H6 transition was observed under 976 nm pump radiation in both of the co-doped glasses. This indicated the existence of efficient Yb3+ ⇥ Tm3+ energy transfer via three-photon absorption mechanism. Thermal and optical results substantiate the claim for practical applicability of the manufactured glasses in design of optical fiber sources.

scholarly journals Comprehensive Kinetics of the Photocatalytic Degradation of Emerging Pollutants in a LED-Assisted Photoreactor. S-Metolachlor as Case Study

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 48
Author(s):  
Laura Rancaño ◽  
Maria J. Rivero ◽  
Miguel Ángel Mueses ◽  
Inmaculada Ortiz
Keyword(s):  
Scale Up ◽  
Emerging Pollutants ◽  
Photon Absorption ◽  
Radiation Absorption ◽  
Reactor Performance ◽  
Photocatalytic Reactor ◽  
Operating Variables ◽  
Degradation Reactions ◽  
Volumetric Rate ◽  
Kinetics Of

Although the potential and beneficial characteristics of photocatalysis in the degradation of a good number of emerging pollutants have been widely studied and demonstrated, process design and scale-up are restrained by the lack of comprehensive models that correctly describe the performance of photocatalytic reactors. Together with the kinetics of degradation reactions, the distribution of the radiation field in heterogeneous photocatalytic systems is essential to the optimum design of the technology. Both the Local Volumetric Rate of Photon Absorption (LVRPA) and the Overall Volumetric Rate of Photon Absorption (OVRPA) help to understand this purpose. This work develops a Six-Flux radiation absorption–scattering model coupled to the Henyey–Greenstein scattering phase function to evaluate the LVRPA profile in a LED-assisted photocatalytic reactor. Moreover, the OVRPA has been calculated and integrated into the kinetic equation, accounting for the influence of the radiation distribution on the reaction rate. The model has been validated with experimental data for the degradation of S-Metolachlor (MTLC), and the set of operating variables that maximize the reactor performance, 0.5 g/L of TiO2 P25 and pH 3, has been determined.

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