Accedi

Bibliografie tematiche / Spontaneous emission of Hydrogen atoms / Articoli di riviste

Articoli di riviste sul tema "Spontaneous emission of Hydrogen atoms"

Segui questo link per vedere altri tipi di pubblicazioni sul tema: Spontaneous emission of Hydrogen atoms.

Autore: Grafiati

Pubblicato: 7 luglio 2024

Ultima modifica: 7 luglio 2024

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili

Scegli il tipo di fonte:

Vedi i top-50 articoli di riviste per l'attività di ricerca sul tema "Spontaneous emission of Hydrogen atoms".

Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.

Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.

Vedi gli articoli di riviste di molte aree scientifiche e compila una bibliografia corretta.

1

Cao, Chang-qi, Xiao-wei Fu e Hui Cao. "Non-Markovian theory of relativistic electric-dipole spontaneous emission of hydrogen-like atoms". Journal of Optics B: Quantum and Semiclassical Optics 7, n. 2 (7 gennaio 2005): 43–53. http://dx.doi.org/10.1088/1464-4266/7/2/003.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Архипов, Р. М., М. В. Архипов, И. Бабушкин, А. В. Пахомов e Н. Н. Розанов. "Генерация аттосекундного импульса на основе коллективного спонтанного излучения слоя трехуровневых атомов, возбуждаемых парой униполярных импульсов". Журнал технической физики 128, n. 11 (2020): 1723. http://dx.doi.org/10.21883/os.2020.11.50176.182-20.

Testo completo

Abstract (sommario):

Recently, for the generation of extremely short pulses, a method was proposed for coherent control of the polarization of a medium, based on the excitation of atomic polarization oscillations and their subsequent arrest using a pair of ultra short pulses. The so-called stopped pulse of polarization of the medium, which appears in the interval between its excitation and de-excitation, can be a source of an extremely short radiation pulse. In this paper, the indicated possibility of generating an isolated attosecond ultraviolet pulse in a three-level resonant medium, the parameters of which correspond to a hydrogen atom excited by a pair of unipolar X-ray pulses, is considered theoretically. In this case, the generation mechanism is "antenna", that is, it is caused by the collective spontaneous emission of pre-phased atoms in the absence of a noticeable decay of their free polarization. Key words: collective spontaneous emission, coherent control of atomic polarization, attosecond pulses, unipolar pulses, X-ray pulses, hydrogen atom.

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Druett, M. K., e V. V. Zharkova. "HYDRO2GEN: Non-thermal hydrogen Balmer and Paschen emission in solar flares generated by electron beams". Astronomy & Astrophysics 610 (febbraio 2018): A68. http://dx.doi.org/10.1051/0004-6361/201731053.

Testo completo

Abstract (sommario):

Aim. Sharp rises of hard X-ray (HXR) emission accompanied by Hα line profiles with strong red-shifts up to 4 Å from the central wavelength, often observed at the onset of flares with the Specola Solare Ticinese Telescope (STT) and the Swedish Solar Telescope (SST), are not fully explained by existing radiative models. Moreover, observations of white light (WL) and Balmer continuum emission with the Interface Region Imaging Spectrograph (IRISH) reveal strong co-temporal enhancements and are often nearly co-spatial with HXR emission. These effects indicate a fast effective source of excitation and ionisation of hydrogen atoms in flaring atmospheres associated with HXR emission. In this paper, we investigate electron beams as the agents accounting for the observed hydrogen line and continuum emission. Methods. Flaring atmospheres are considered to be produced by a 1D hydrodynamic response to the injection of an electron beam defining their kinetic temperatures, densities, and macro velocities. We simulated a radiative response in these atmospheres using a fully non-local thermodynamic equilibrium (NLTE) approach for a 5-level plus continuum hydrogen atom model, considering its excitation and ionisation by spontaneous, external, and internal diffusive radiation and by inelastic collisions with thermal and beam electrons. Simultaneous steady-state and integral radiative transfer equations in all optically thick transitions (Lyman and Balmer series) were solved iteratively for all the transitions to define their source functions with the relative accuracy of 10−5. The solutions of the radiative transfer equations were found using the L2 approximation. Resulting intensities of hydrogen line and continuum emission were also calculated for Balmer and Paschen series. Results. We find that inelastic collisions with beam electrons strongly increase excitation and ionisation of hydrogen atoms from the chromosphere to photosphere. This leads to an increase in Lyman continuum radiation, which has high optical thickness, and after the beam is off it governs hydrogen ionisation and leads to the long lasting orders of magnitude enhancement of emission in Balmer and Paschen continua. The ratio of Balmer-to-other-continuum head intensities are found to be correlated with the initial flux of the beam. The height distribution of contribution functions for Paschen continuum emission indicate a close correlation with the observations of heights of WL and HXR emission reported for limb flares. This process also leads to a strong increase of wing emission (Stark’s wings) in Balmer and Paschen lines, which is superimposed on large red-shifted enhancements of Hα-Hγ line emission resulting from a downward motion by hydrodynamic shocks. The simulated line profiles are shown to fit closely the observations for various flaring events.

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Cao, Chang-qi, Xiao-wei Fu e Hui Cao. "Non-Markovian study of the relativistic magnetic-dipole spontaneous emission process of hydrogen-like atoms". Journal of Physics B: Atomic, Molecular and Optical Physics 39, n. 8 (10 aprile 2006): 2071–85. http://dx.doi.org/10.1088/0953-4075/39/8/022.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Shimoda, Jiro, e J. Martin Laming. "Radiative transfer of hydrogen lines from supernova remnant shock waves: contributions of 2s-state hydrogen atoms". Monthly Notices of the Royal Astronomical Society 485, n. 4 (16 marzo 2019): 5453–67. http://dx.doi.org/10.1093/mnras/stz758.

Testo completo

Abstract (sommario):

Abstract Radiative transfer in hydrogen lines in supernova remnant (SNR) shock waves is studied taking into account the population of the hydrogen atom 2s-state. Measurements of Balmer line emission, especially of H α, are often relied on to derive physical conditions in the SNR shock. On the other hand, Lyman series photons, especially Ly β, are mostly absorbed by upstream hydrogen atoms. As a result, atoms are excited to the 3p state, and then emit H α by the spontaneous transition from 3p to 2s. Thus, the nature of H α depends on how many Ly β photons are converted to H α photons. Moreover, the Balmer lines can be scattered by the 2s-state hydrogen atoms, which are excited not only by collisional excitation but also by the Lyman–Balmer conversion. It is shown for example that the H α photons are scattered if the shock propagates into an H i cloud with a density of ∼30 cm−3 and a size of ∼1 pc. We find that the line profile of H α becomes asymmetric resulting from the difference between line centre frequencies among the transitions from 3s to 2p, from 3p to 2s, and from 3d to 2p. We also find that the broad-to-narrow ratio of H α, which is often used to estimate the ion-electron temperature equilibrium, varies at most ≃ 10 per cent depending on the ionization degree of the upstream medium because of incomplete conversion of Lyman lines to Balmer lines.

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Jahanpanah, J. "The forming mechanism of spontaneous emission noise flux radiated from hydrogen-like atoms by means of vibrational Hamiltonian". AIP Advances 11, n. 3 (1 marzo 2021): 035203. http://dx.doi.org/10.1063/5.0036017.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Druett, M. K., e V. V. Zharkova. "Non-thermal hydrogen Lyman line and continuum emission in solar flares generated by electron beams". Astronomy & Astrophysics 623 (26 febbraio 2019): A20. http://dx.doi.org/10.1051/0004-6361/201732427.

Testo completo

Abstract (sommario):

Aims. Hydrogen Lyman continuum emission is greatly enhanced in the impulsive kernels of solar flares, with observations of Lyman lines showing impulsive brightening and both red and blue wing asymmetries, based on the images with low spatial resolution. A spate of proposed instruments will study Lyman emission in more detail from bright, impulsive flare kernels. In support of new instrumentation we aim to apply an improved interpretation of Lyman emission with the hydrodynamic radiative code, HYDRO2GEN, which has already successfully explained Hα emission with large redshifts and sources of white light emission in solar flares. The simulations can interpret the existing observations and propose observations in the forthcoming missions. Methods. A flaring atmosphere is considered to be produced by a 1D hydrodynamic response to injection of an electron beam, defining depth variations of electron and ion kinetic temperatures, densities, and macro-velocities. Radiative responses in this flaring atmosphere affected by the beams with different parameters are simulated using a fully non-local thermodynamic equilibrium (NLTE) approach for a five-level plus continuum model hydrogen atom with excitation and ionisation by spontaneous, external, and internal diffusive radiation, and by inelastic collisions with thermal and beam electrons. Integral radiative transfer equations for all optically thick transitions are solved using the L2 approximation simultaneously with steady state equations. Results. During a beam injection in the impulsive phase there is a large increase of collisional ionisation and excitation by non-thermal electrons that strongly (by orders of magnitude) increases excitation and the ionisation degree of hydrogen atoms from all atomic levels. These non-thermal collisions combined with plasma heating caused by beam electrons lead to an increase in Lyman line and continuum radiation, which is highly optically thick. During a beam injection phase the Lyman continuum emission is greatly enhanced in a large range of wavelengths resulting in a flattened distribution of Lyman continuum over wavelengths. After the beam is switched off, Lyman continuum emission, because of its large opacity, sustains, for a very long time, the high ionisation degree of the flaring plasma gained during the beam injection. This leads to a long enhancement of hydrogen ionisation, occurrence of white light flares, and an increase of Lyman line emission in cores and wings, whose shapes are moved closer to those from complete redistribution (CRD) in frequencies, and away from the partial ones (PRD) derived in the non-flaring atmospheres. In addition, Lyman line profiles can reflect macro-motions of a flaring atmosphere caused by downward hydrodynamic shocks produced in response to the beam injection reflected in the enhancements of Ly-line red wing emission. These redshifted Ly-line profiles are often followed by the enhancement of Ly-line blue wing emission caused by the chromospheric evaporation. The ratio of the integrated intensities in the Lyα and Lyβ lines is lower for more powerful flares and agrees with reported values from observations, except in the impulsive phase in flaring kernels which were not resolved in previous observations, in which the ratio is even lower. These results can help observers to design the future observations in Lyman lines and continuum emission in flaring atmospheres.

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Ungor, Ditta, Gyöngyi Gombár, Ádám Juhász, Gergely F. Samu e Edit Csapó. "Promising Bioactivity of Vitamin B1-Au Nanocluster: Structure, Enhanced Antioxidant Behavior, and Serum Protein Interaction". Antioxidants 12, n. 4 (3 aprile 2023): 874. http://dx.doi.org/10.3390/antiox12040874.

Testo completo

Abstract (sommario):

In the current work, we first present a simple synthesis method for the preparation of novel Vitamin-B1-stabilized few-atomic gold nanoclusters with few atomic layers. The formed nanostructure contains ca. eight Au atoms and shows intensive blue emissions at 450 nm. The absolute quantum yield is 3%. The average lifetime is in the nanosecond range and three main components are separated and assigned to the metal–metal and ligand–metal charge transfers. Based on the structural characterization, the formed clusters contain Au in zero oxidation state, and Vitamin B1 stabilizes the metal cores via the coordination of pyrimidine-N. The antioxidant property of the Au nanoclusters is more prominent than that of the pure Vitamin B1, which is confirmed by two different colorimetric assays. For the investigation into their potential bioactivity, interactions with bovine serum albumin were carried out and quantified. The determined stoichiometry indicates a self-catalyzed binding, which is almost the same value based on the fluorometric and calorimetric measurements. The calculated thermodynamic parameters verify the spontaneous bond of the clusters along the protein chain by hydrogen bonds and electrostatic interactions.

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Tana, R., e Z. Ficek. "Entangling two atoms via spontaneous emission". Journal of Optics B: Quantum and Semiclassical Optics 6, n. 3 (1 marzo 2004): S90—S97. http://dx.doi.org/10.1088/1464-4266/6/3/015.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Żakowicz, W. "Spontaneous Emission by Atoms in Simple Environments". Acta Physica Polonica A 101, n. 1 (gennaio 2002): 119–31. http://dx.doi.org/10.12693/aphyspola.101.119.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

11

Japha, Y., e G. Kurizki. "Spontaneous Emission from Tunneling Two-Level Atoms". Physical Review Letters 77, n. 14 (30 settembre 1996): 2909–12. http://dx.doi.org/10.1103/physrevlett.77.2909.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

12

Fu, Chun-rong, e Chang-de Gong. "Spontaneous emission by two three-level atoms". Physical Review A 45, n. 7 (1 aprile 1992): 5095–103. http://dx.doi.org/10.1103/physreva.45.5095.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

13

Musabayeva, G. К., А. Т. Аkilbekov e K. K. Musabayev. "On the origin of spontaneous emission of atoms". Bulletin of L.N. Gumilyov Eurasian National University. PHYSICS. ASTRONOMY Series 122, n. 1 (2018): 64–67. http://dx.doi.org/10.32523/2616-6836-2018-122-1-64-67.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

14

Marecki, P., e N. Szpak. "Spontaneous emission of light from atoms: the model". Annalen der Physik 517, n. 7 (21 giugno 2005): 428–37. http://dx.doi.org/10.1002/andp.20055170702.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

15

Savalli, V., G. Zs K. Horvath, P. D. Featonby, L. Cognet, N. Westbrook, C. I. Westbrook e A. Aspect. "Optical detection of cold atoms without spontaneous emission". Optics Letters 24, n. 22 (15 novembre 1999): 1552. http://dx.doi.org/10.1364/ol.24.001552.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

16

Guo, Guang-Can, e Chui-Ping Yang. "Spontaneous emission from two two-level entangled atoms". Physica A: Statistical Mechanics and its Applications 260, n. 1-2 (novembre 1998): 173–85. http://dx.doi.org/10.1016/s0378-4371(98)00294-5.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

17

Marecki, P., e N. Szpak. "Spontaneous emission of light from atoms: the model". Annalen der Physik 14, n. 7 (8 luglio 2005): 428–37. http://dx.doi.org/10.1002/andp.200410143.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

18

Dehua Wang, 王德华. "Spontaneous emission of two interacting atoms near an interface". Chinese Optics Letters 7, n. 10 (2009): 926–30. http://dx.doi.org/10.3788/col20090710.0926.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

19

James, Daniel F. V. "Frequency shifts in spontaneous emission from two interacting atoms". Physical Review A 47, n. 2 (1 febbraio 1993): 1336–46. http://dx.doi.org/10.1103/physreva.47.1336.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

20

Lewenstein, Maciej, Jakub Zakrzewski e Thomas W. Mossberg. "Spontaneous emission of atoms coupled to frequency-dependent reservoirs". Physical Review A 38, n. 2 (1 luglio 1988): 808–19. http://dx.doi.org/10.1103/physreva.38.808.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

21

Bogatskaya, A. V., E. A. Volkova e A. M. Popov. "Spontaneous emission of atoms in a strong laser field". Journal of Experimental and Theoretical Physics 125, n. 4 (ottobre 2017): 587–96. http://dx.doi.org/10.1134/s1063776117090114.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

22

Takada, Akiyoshi, e Kikuo Ujihara. "Spontaneous emission by two atoms in a planar microcavity". Optics Communications 160, n. 1-3 (febbraio 1999): 146–61. http://dx.doi.org/10.1016/s0030-4018(98)00634-8.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

23

Prants, Sergei V., e V. I. Yusupov. "Structural chaos in reversible spontaneous emission of moving atoms". Quantum Electronics 30, n. 7 (31 luglio 2000): 647–52. http://dx.doi.org/10.1070/qe2000v030n07abeh001783.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

24

Minieiev, Serhii, Alla Prusova, Oleksii Yanzhula e Oleksandr Minieiev. "ASSESSSMENT OF THE SORPTION EQUILIBRRIUM OF METHANE DURING ITS GENERATION IN A COAL SEAM". Naukovyi visnyk Donetskoho natsionalnoho tekhnichnoho universytetu, n. 1-2 (2022): 106–18. http://dx.doi.org/10.31474/2415-7902-2022-1(8)-2(9)-106-118.

Testo completo

Abstract (sommario):

Purpose. Study the adsorption equilibrium of adsorbed during the generation of methane in coal massif to determine the conditions for its implementation at different depths of mining operations. Methods. The thermodynamic research methodology, numerical calculation methods, mathematical processing of research results using approximation methods. Results. The entropy change of the «adsorbed methane – coal» system shows that the initial state of adsorbed methane during its generation in a coal seams determined by the depth of the seam and the degree of filling of its pores with methane. The results of the calculation showed, that the sorption equilibrium of the “methane – coal” system in the mountain massif is energetically most probable at the degree of filling of the pores with methane, which is θ = 40%. When θ < 40 % an irreversible spontaneous process of adsorption of methane by coal occurs, but when θ > 40% – its desorption, the degree intensity of which can be estimated by the ratio obtained in the work. It has been established that at the depth of the coal seam there is only low-intensity process, and at Н > 500 m – the process is more intensive. Therefore, when methane is generated at depths of Н < 500 m, it is likely that due to weak desorption and high sorption bond energy, the pores tend to be filled with methane almost completely. When Н > 500 m they tend to sorption equilibrium, so they are filled with methane by only 40%. The rest of the volume of gas generated in the coal seam at depths greater than 500 m, as a result of an intensive desorption process, migrates into the intervening rock seam. Scientific novelty. As opposed to a priori accepting opinions about what the initial state of methane adsorbed in coal is always characterized by the complete filling of pores with gas, numerical calculations dedicated to this issue have been performed for the first time in the paper. Calculations are based on modern ideas about the generation of methane in coal with the help of the separation of methyl group and hydrogen atoms from aliphatic fringes, which combine to form methane molecules. At the same time, the dependence of the change in the entropy of the “adsorbed coal – methane” system on the depth of occurrence and the degree of filling of its pores with methane during the generation of methane in the coal seam has been established. Practical significance. The research results make it possible to obtain fundamentally new regularities of the processes of mass transfer and filtration of methane in the mountain massif at great depths. The use of new laws makes it possible to adjust the existing technologies of mine ventilation and methods of safe mining operations in emission-hazardous and highly gas-bearing coal seams, to develop fundamentally new technologies in this direction, as well as to make more accurate calculations of methane reserves in various rocks of the mountain massif.

Gli stili APA, Harvard, Vancouver, ISO e altri

25

Mancini, Stefano, Vladimir I. Man'ko e Paolo Tombesi. "Collective Spontaneous Emission in a q-Deformed Dicke Model". Modern Physics Letters B 12, n. 11 (10 maggio 1998): 403–11. http://dx.doi.org/10.1142/s0217984998000494.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

26

Eggleston, Michael S., Kevin Messer, Liming Zhang, Eli Yablonovitch e Ming C. Wu. "Optical antenna enhanced spontaneous emission". Proceedings of the National Academy of Sciences 112, n. 6 (26 gennaio 2015): 1704–9. http://dx.doi.org/10.1073/pnas.1423294112.

Testo completo

Abstract (sommario):

Atoms and molecules are too small to act as efficient antennas for their own emission wavelengths. By providing an external optical antenna, the balance can be shifted; spontaneous emission could become faster than stimulated emission, which is handicapped by practically achievable pump intensities. In our experiments, InGaAsP nanorods emitting at ∼200 THz optical frequency show a spontaneous emission intensity enhancement of 35× corresponding to a spontaneous emission rate speedup ∼115×, for antenna gap spacing, d = 40 nm. Classical antenna theory predicts ∼2,500× spontaneous emission speedup at d ∼ 10 nm, proportional to 1/d2. Unfortunately, at d < 10 nm, antenna efficiency drops below 50%, owing to optical spreading resistance, exacerbated by the anomalous skin effect (electron surface collisions). Quantum dipole oscillations in the emitter excited state produce an optical ac equivalent circuit current, Io = qω|xo|/d, feeding the antenna-enhanced spontaneous emission, where q|xo| is the dipole matrix element. Despite the quantum-mechanical origin of the drive current, antenna theory makes no reference to the Purcell effect nor to local density of states models. Moreover, plasmonic effects are minor at 200 THz, producing only a small shift of antenna resonance frequency.

Gli stili APA, Harvard, Vancouver, ISO e altri

27

Qi, Xuyao, Haibo Xue, Haihui Xin e Cunxiang Wei. "Reaction pathways of hydroxyl groups during coal spontaneous combustion". Canadian Journal of Chemistry 94, n. 5 (maggio 2016): 494–500. http://dx.doi.org/10.1139/cjc-2015-0605.

Testo completo

Abstract (sommario):

Hydroxyl groups are one of the key factors for the development of coal self-heating, although their detailed reaction pathways are still unclear. This study investigated the reaction pathways in coal self-heating by the method of quantum chemistry calculation. The Ar–CH2–CH(CH3)–OH was selected as a typical structure unit for the calculation. The results indicate that the hydrogen atoms in hydroxyl groups and R3–CH are the active sites. For the hydrogen atoms in hydroxyl groups, they are directly abstracted by oxygen. For hydrogen atoms in R3–CH, they are abstracted by oxygen at first and generate peroxy-hydroxyl free radicals, which abstract the hydrogen atoms in hydroxyl groups later. The reaction of R3–CH contains three elementary reactions, i.e., the hydrogen abstraction of R3–CH by oxygen, the conjugation reaction between the R3C■ and oxygen atom, and the hydrogen abstraction of –OH by hydroxyl free radicals. Then, the microstructure parameters, IRC pathways, and reaction dynamic parameters were respectively analyzed for the four reactions. For the hydrogen abstraction of –OH by oxygen, the enthalpy change and activation energy are 137.63 and 334.44 kJ/mol, respectively, which will occur at medium temperatures and the corresponding heat effect is great. For the reaction of R3–CH, the enthalpy change and the activation energy are −3.45 and 55.79 kJ/mol, respectively, which will occur at low temperatures while the corresponding heat influence is weak. They both affect heat accumulation and provide new active centers for enhancing the coal self-heating process. The results would be helpful for further understanding of the coal self-heating mechanism.

Gli stili APA, Harvard, Vancouver, ISO e altri

28

Stancil, P. C., e G. E. Copeland. "Magnetic-field-enhanced spontaneous two-photon emission of hydrogenic atoms". Physical Review A 48, n. 1 (1 luglio 1993): 516–24. http://dx.doi.org/10.1103/physreva.48.516.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

29

Meschede, D. "Radiating atoms in confined space: From spontaneous emission to micromasers". Physics Reports 211, n. 5 (febbraio 1992): 201–50. http://dx.doi.org/10.1016/0370-1573(92)90110-l.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

30

Alemu, Menisha. "Spontaneous Emission by Three-level Atoms Pumped by Electron Bombardment". Universal Journal of Physics and Application 14, n. 1 (marzo 2020): 11–22. http://dx.doi.org/10.13189/ujpa.2020.140102.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

31

Shalom, A. "Inhibited spontaneous emission and energy oscillation between two-level atoms". Physical Review A 45, n. 1 (1 gennaio 1992): 443–45. http://dx.doi.org/10.1103/physreva.45.443.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

32

Bužek, V. "Spontaneous emission from a system of nonidentical two-level atoms". Czechoslovak Journal of Physics 38, n. 10 (ottobre 1988): 1164–73. http://dx.doi.org/10.1007/bf01598018.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

33

Alinejad, Naser, e Noushin Pishbin. "Spontaneous Emission of an Excited Atom in a Dusty Unmagnetized Plasma Medium". Advances in Materials Science and Engineering 2014 (2014): 1–4. http://dx.doi.org/10.1155/2014/746742.

Testo completo

Abstract (sommario):

Investigation of spontaneous decay of an excited atom in dusty unmagnetized plasma is presented in this paper. The transverse contribution to the decay rate is normally associated with spontaneous emission. The rate of spontaneous emission can be obtained by Fermi’s golden rule. In this calculation, the transverse contribution to dielectric permittivity and Green function technique are used. Calculation of the decay rate of atoms is applicable to understand the particular structure of the vacuum state of the electromagnetic field.

Gli stili APA, Harvard, Vancouver, ISO e altri

34

Prepelita, Oleg. "Spontaneous decay in cold dense atomic systems: caloric effect and spectrum of emitted light". Canadian Journal of Physics 94, n. 7 (luglio 2016): 1–12. http://dx.doi.org/10.1139/cjp-2016-0098.

Testo completo

Abstract (sommario):

We discuss collision-induced spontaneous decay in a system of cold atoms and caloric effect manifesting in the heating of the atomic system during spontaneous decay. It is shown that the caloric effect is caused by inelastic atom–atom collisions accompanied by the spontaneous emission of photons. Because of the imbalance between the rate of emission of the photons with the frequency higher and lower than the atomic transition frequency, the atomic system, under some conditions, is heated up. The value of the critical temperature is found, which separates the regions where the collision-induced spontaneous decay is exothermic and endothermic.

Gli stili APA, Harvard, Vancouver, ISO e altri

35

SONG, KAI, RENAUD VALLEE, MARK VAN DER AUWERAER e KOEN CLAYS. "SPONTANEOUS EMISSION OF NANO-ENGINEERED FLUOROPHORES IN PHOTONIC CRYSTALS". Journal of Nonlinear Optical Physics & Materials 15, n. 01 (marzo 2006): 1–8. http://dx.doi.org/10.1142/s0218863506003128.

Testo completo

Abstract (sommario):

The spontaneous emission of fluorophores embedded in a photonic crystal has been studied. By nano-engineering a sandwich-like photonic structure, such that fluorophore-coated photonic atoms constitute a middle layer between the photonic crystals, we have been able to precisely control the location of fluorophores in photonic crystals and exclude the presence of fluorophores at the surface of the crystal. It has been found that the stopband in the transmission spectrum is deeper than the stopband in the emission spectrum. We conjecture that the omnidirectional propagation of the emission from a point source in an incomplete photonic bandgap is the cause of the shallower stopband in emission.

Gli stili APA, Harvard, Vancouver, ISO e altri

36

LUO ZHEN-FEI, XU ZHI-ZHAN, XU LEI e LIANG SHI-DONG. "A GENERAL THEORY OF SPONTANEOUS-EMISSION LINE SHAPE OF TWO ATOMS". Acta Physica Sinica 42, n. 6 (1993): 925. http://dx.doi.org/10.7498/aps.42.925.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

37

Freedhoff, H. S. "Spontaneous emission by a fully excited system of three identical atoms". Journal of Physics B: Atomic and Molecular Physics 19, n. 19 (14 ottobre 1986): 3035–50. http://dx.doi.org/10.1088/0022-3700/19/19/017.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

38

Zhao, H., e K. Ujihara. "Interference effects in the spontaneous emission from two initially excited atoms". Journal of Modern Optics 53, n. 5-6 (20 marzo 2006): 835–55. http://dx.doi.org/10.1080/09500340500159732.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

39

Ujihara, Kikuo. "Spontaneous emission in a micro optical cavity from spectrally broadened atoms". Optics Communications 103, n. 3-4 (novembre 1993): 265–76. http://dx.doi.org/10.1016/0030-4018(93)90453-c.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

40

Ficek, Z. "Spontaneous emission from two atoms interacting with a broadband squeezed vacuum". Physical Review A 42, n. 1 (1 luglio 1990): 611–17. http://dx.doi.org/10.1103/physreva.42.611.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

41

Leonardi, C., e F. Seminara. "Spontaneous emission of two dipolarly coupled atoms in a damped cavity". Physics Letters A 138, n. 4-5 (giugno 1989): 197–200. http://dx.doi.org/10.1016/0375-9601(89)90027-3.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

42

Liu, Hui, Qing Yang, Ming Yang e Zhuoliang Cao. "Improving entanglement of two atoms in strong coupling regime". International Journal of Modern Physics B 30, n. 07 (18 marzo 2016): 1650033. http://dx.doi.org/10.1142/s0217979216500338.

Testo completo

Abstract (sommario):

We consider a model of two identical atoms coupled to a single-mode cavity. When in atom-field strong coupling regime, the entanglement of the two atoms with spontaneous emission should be investigated beyond rotating-wave approximation (RWA). In order to improve the entanglement of the two atoms, some typical feedback based on quantum-jump are attempted to impose on the atoms. The result of numerical simulations shows that an appropriate feedback control can improve the entanglement.

Gli stili APA, Harvard, Vancouver, ISO e altri

43

Marchuk, Oleksandr, Sven Dickheuer, Stephan Ertmer, Yuri Krasikov, Philippe Mertens, Christian Brandt, Sebastijan Brezinsek et al. "Emission of Fast Hydrogen Atoms in a Low Density Gas Discharge—The Most “Natural” Mirror Laboratory". Atoms 7, n. 3 (19 agosto 2019): 81. http://dx.doi.org/10.3390/atoms7030081.

Testo completo

Abstract (sommario):

In this work, we present a new application for the line shapes of emission induced by reflected hydrogen atoms. Optical properties of the solids in contact with the plasma could be effectively measured at the wavelength of Balmer lines: time-resolved measurements of reflectance and polarization properties of mirrors are performed using the wavelength separation of the direct and reflected signals. One uses the Doppler effect of emission of atoms excited by collisions with noble gases, primarily with Ar or with Kr. In spite of a new application of line shapes, the question of the source of the strong signal in the case of Ar exists: the emission observed in the case of the excitation of H or D atoms by Ar exceeds the signal induced by collisions with Kr atoms by a factor of five, and the only available experimental data for the ground state excitation show practically equal cross-sections for both gases in the energy range of 80–200 eV.

Gli stili APA, Harvard, Vancouver, ISO e altri

44

Zeng Ran, 曾然, 侯金鑫 Hou Jinxin, 王驰 Wang Chi, 李齐良 Li Qiliang, 毕美华 Bi Meihua, 杨国伟 Yang Guowei e 羊亚平 Yang Yaping. "Spontaneous Emission Characteristics of Atoms near Topological Insulator Slab with Finite Thickness". Acta Optica Sinica 38, n. 9 (2018): 0927001. http://dx.doi.org/10.3788/aos201838.0927001.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

45

Hu, Ming-Liang. "Teleporting the one-qubit state via two-level atoms with spontaneous emission". Journal of Physics B: Atomic, Molecular and Optical Physics 44, n. 9 (19 aprile 2011): 095502. http://dx.doi.org/10.1088/0953-4075/44/9/095502.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

46

Wilkens, Martin. "Significance of Röntgen current in quantum optics: Spontaneous emission of moving atoms". Physical Review A 49, n. 1 (1 gennaio 1994): 570–73. http://dx.doi.org/10.1103/physreva.49.570.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

47

Heinzen, D. J., J. J. Childs, J. E. Thomas e M. S. Feld. "Enhanced and inhibited visible spontaneous emission by atoms in a confocal resonator". Physical Review Letters 58, n. 13 (30 marzo 1987): 1320–23. http://dx.doi.org/10.1103/physrevlett.58.1320.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

48

Heinzen, D. J., J. J. Childs, J. E. Thomas e M. S. Feld. "Enhanced and Inhibited Visible Spontaneous Emission by Atoms in a Confocal Resonator". Physical Review Letters 58, n. 20 (18 maggio 1987): 2153. http://dx.doi.org/10.1103/physrevlett.58.2153.5.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

49

Mecking, Birgit S., e P. Lambropoulos. "Effects of spontaneous emission on nondispersing wave packets in two-electron atoms". Physical Review A 57, n. 3 (1 marzo 1998): 2014–20. http://dx.doi.org/10.1103/physreva.57.2014.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

50

Schuurmans, Frank J. P., Pedro de Vries e Ad Lagendijk. "Local-field effects on spontaneous emission of impurity atoms in homogeneous dielectrics". Physics Letters A 264, n. 6 (gennaio 2000): 472–77. http://dx.doi.org/10.1016/s0375-9601(99)00855-5.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Offriamo sconti su tutti i piani premium per gli autori le cui opere sono incluse in raccolte letterarie tematiche. Contattaci per ottenere un codice promozionale unico!