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Articles de revues sur le sujet « Inhomogeneous spectral line broadening »

Auteur : Grafiati
Publié le 21 décembre 2024

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1

Igo, A. V. « Inhomogeneous size broadening of the Raman scattering spectral line in nanocrystals ». Optics and Spectroscopy 120, no 4 (avril 2016) : 529–33. http://dx.doi.org/10.1134/s0030400x16040093.

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2

Parker, J. C., et R. W. Siegel. « Raman microprobe study of nanophase TiO2 and oxidation-induced spectral changes ». Journal of Materials Research 5, no 6 (juin 1990) : 1246–52. http://dx.doi.org/10.1557/jmr.1990.1246.

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A Raman microprobe study of as-compacted nanophase TiO2 was carried out to investigate the spatial inhomogeneity of its anatase and rutile phases. Also, changes in the observed Raman spectra (line shifts and broadening) were investigated as a function of annealing at temperatures up to 600°C in argon or air. Microscopic phase inhomogeneity is observed and Raman spectral changes are shown to result from inhomogeneous oxygen deficiency in the nanophase TiO2. The line positions corresponding to the Raman active Eg modes in both anatase and rutile are found to be sensitive to this oxygen deficiency and are potential quantitative indicators of such deviations from stoichiometry.
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3

Maniloff, Eric S., Alan E. Johnson et Thomas W. Mossberg. « Spectral Data Storage Using Rare-Earth-Doped Crystals ». MRS Bulletin 24, no 9 (septembre 1999) : 46–50. http://dx.doi.org/10.1557/s0883769400053069.

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Conventional optical data-storage techniques, such as magneto-optic disks and CD-ROMs, record a single bit of information at each particular substrate location. In order to produce the gigabyte-class storage substrates demanded by today's computers using such conventional technologies, access to tens of billions of individual material locations is required. This brute-force approach to optical data storage has produced impressive results. However, there is increasing interest in methods for more efficiently accessing storage materials. One approach is to record multiple bits at a single storage-material location. This can be accomplished by multiplexing the bits spectrally, using differing optical frequencies to record data bits. It has been realized for over 20 years that when certain materials are cooled to appropriate temperatures, typically below 20 K, the possibility of spectrally multiplexing large numbers of bits in a single material location arises. Although this approach, known as spectral hole-burning, has been proposed as a data-storage mechanism, to date it has primarily been used as a tool to study material properties. Rare-earth-doped crystals have been demonstrated to have properties that lend themselves to a variety of different spectral hole-burning-based data-storage applications. In this article, we will review the principles of spectral hole-burning, discuss some specific material systems in which spectral hole-burning is of particular interest, and describe methods for producing high-capacity, high-data-rate spectral memories.Spectral hole-burning, and spectral memories based on spectral hole-burning, depend on a material property referred to as inhomogeneous absorption line broadening. Materials exhibiting this property contain active atoms or molecules that individually respond to (absorb) very specific frequencies of light, but the collective response of all of the material's active atoms or molecules covers a spectral region that is broad compared with the response of a particular active atom or molecule. Inhomogeneous absorption line broadening is caused by local variations in the structure of the host, which in turn lead to variations in the electronic levels of the active atoms or molecules. The absorption linewidth of an individual absorber is referred to as the homogeneous linewidth Γh, and the absorption width of a collection of inhomogeneously broadened absorption centers is referred to as the inhomogeneous linewidth Γi. Application of monochromatic light to such a material has the effect of exciting only a very small subset of active absorbing atoms—those residing in the illuminated spatial volume within a homogeneous width of the exciting light's specific frequency. If the frequency of the imposed light is shifted, a different subset of active absorbing atoms in the illuminated volume responds.
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4

Normani, Simone, Pavel Loiko, Roman Maksimov, Vladislav Shitov, Vladimir Osipov, Alain Braud et Patrice Camy. « Inhomogeneous spectral line broadening and site distribution in “mixed” Er:(Sc,Y)2O3 laser ceramics ». EPJ Web of Conferences 309 (2024) : 06009. http://dx.doi.org/10.1051/epjconf/202430906009.

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Erbium-doped “mixed” yttria-scandia (ScxY1-x)2O3 transparent laser ceramics were fabricated by vacuum sintering at 1750 °C from laser-ablated nanoparticles. Their absorption and mid-infrared emission properties were studied. The addition of Sc3+ induces a strong inhomogeneous spectral line broadening, modifies the crystal field and affects the distribution of Er3+ ions over C2 and C3i symmetry sites. Due to their broadband emission properties, Er:(ScxY1-x)2O3 ceramics are appealing for 2.8-μm lasers.
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5

Laman, N., S. Sree Harsha et D. Grischkowsky. « Narrow-Line Waveguide Terahertz Time-Domain Spectroscopy of Aspirin and Aspirin Precursors ». Applied Spectroscopy 62, no 3 (mars 2008) : 319–26. http://dx.doi.org/10.1366/000370208783759768.

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Low frequency vibrational modes of pharmaceutical molecules are dependent on the molecule as a whole and can be used for identification purposes. However, conventional Fourier transform far-infrared spectroscopy (FT-IR) and terahertz time-domain spectroscopy (THz-TDS) often result in broad, overlapping features that are difficult to distinguish. The technique of waveguide THz-TDS has been recently developed, resulting in sharper spectral features. Waveguide THz-TDS consists of forming an ordered polycrystalline film on a metal plate and incorporating that plate in a parallel-plate waveguide, where the film is probed by THz radiation. The planar order of the film on the metal surface strongly reduces the inhomogeneous broadening, while cooling the waveguide to 77 K reduces the homogeneous broadening. This combination results in sharper absorption lines associated with the vibrational modes of the molecule. Here, this technique has been demonstrated with aspirin and its precursors, benzoic acid and salicylic acid, as well as the salicylic acid isomers 3- and 4-hydroxybenzoic acid. Linewidths as narrow as 20 GHz have been observed, rivaling single crystal measurements.
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6

Dragounová, Kateřina, Zdeněk Potůček, Štěpán Potocký, Zdeněk Bryknar et Alexander Kromka. « Determination of temperature dependent parameters of zero-phonon line in photo-luminescence spectrum of silicon-vacancy centre in CVD diamond thin films ». Journal of Electrical Engineering 68, no 1 (1 janvier 2017) : 74–78. http://dx.doi.org/10.1515/jee-2017-0010.

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Abstract In this work we present a methodological approach to the temperature dependence of photoluminescence (PL) emission spectra of the silicon-vacancy centre in diamond thin films prepared by chemical vapour deposition. The PL spectra were measured in the temperature range of 11 - 300 K and used to determine the temperature dependence of the zero-phononline full-width at half-maximum and of the peak position. Experimental data were fitted by models of lattice contraction, quadratic electron-phonon coupling, homogeneous and inhomogeneous broadening. We found that the shift of peak position and peak broadening reflect polynomial dependence on temperature. Moreover, a proper setting of monochromator slits width is discussed with respect to line profile broadening.
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7

Astakhov, G. V., V. P. Kochereshko, V. A. Kosobukin, D. R. Yakovlev, T. Wojtowicz, G. Karczewski, J. Kossut, W. Ossau et G. Landwehr. « Model Study of Inhomogeneous Line Broadening in Excitonic Spectra of Quantum Wells ». Acta Physica Polonica A 94, no 2 (août 1998) : 235–39. http://dx.doi.org/10.12693/aphyspola.94.235.

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8

Liu, G. K., Jin Huang et James V. Beitz. « Microscopic nature of inhomogeneous line broadening : Analysis of the excitation-line-narrowing spectra ofCf4+inCeF4 ». Physical Review B 48, no 18 (1 novembre 1993) : 13351–60. http://dx.doi.org/10.1103/physrevb.48.13351.

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Кочаровская, Е. Р., А. В. Мишин, И. С. Рябинин et В. В. Кочаровский. « Особенности одновременной генерации низко- и высокодобротных мод в гетеролазерах на квантовых точках с большим временем некогерентной релаксации оптических дипольных колебаний ». Физика и техника полупроводников 53, no 10 (2019) : 1329. http://dx.doi.org/10.21883/ftp.2019.10.48285.31.

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We investigate the features of multimode steady-state generation of the superradiant heterolasers which have an active medium formed by the quantum dots with long incoherent relaxation time and a cavity of a combined Fabry-Perot type with a distributed feedback of the counter-propagating waves. We show that a quantum-coherent dynamics of the optical dipole oscillations and a population inversion of the working levels in an ensemble of the quantum dots with a strong inhomogeneous broadening of a spectral line may lead to a simultaneous lasing of modes with a various degree of phasing and/or correlation and with qualitatively different dynamical behavior, including quasi-stationary, metastable, self-modulated, pulsed-periodic, quasi-chaotic ones.
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10

Wei, Zhiliang, Jian Yang, Youhe Chen, Yanqin Lin et Zhong Chen. « Line broadening interference for high-resolution nuclear magnetic resonance spectra under inhomogeneous magnetic fields ». Journal of Chemical Physics 142, no 13 (7 avril 2015) : 134202. http://dx.doi.org/10.1063/1.4916520.

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11

Bonnaud, Guy, Denis Pesme et René Pellat. « Frequency spectra of the Raman-backscattered light in an inhomogeneous plasma ». Laser and Particle Beams 9, no 2 (juin 1991) : 477–92. http://dx.doi.org/10.1017/s0263034600003505.

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The behavior of the stimulated Raman scattering is investigated in a laser-irradiated plasma with an inhomogeneous density profile, by means of wave-coupling simulations. In the case of a regular hydrodynamic-like profile, a spectral broadening is observed when the laser irradiance is increased and is found to result from a coupling between the convective and the absolute Raman scattering, via pump depletion. In the case where a short-scale modulation of the density is superimposed on the profile, the spectrum is strongly influenced by the propagation velocity of the modulation and by the sinusoidal/chaotic nature of the modulation.
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12

Lin, Xiaoqing, Haolin Zhan, Hong Li, Yuqing Huang et Zhong Chen. « NMR Relaxation Measurements on Complex Samples Based on Real-Time Pure Shift Techniques ». Molecules 25, no 3 (22 janvier 2020) : 473. http://dx.doi.org/10.3390/molecules25030473.

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Longitudinal spin-lattice relaxation (T1) and transverse spin-spin relaxation (T2) reveal valuable information for studying molecular dynamics in NMR applications. Accurate relaxation measurements from conventional 1D proton spectra are generally subject to challenges of spectral congestion caused by J coupling splittings and spectral line broadenings due to magnetic field inhomogeneity. Here, we present an NMR relaxation method based on real-time pure shift techniques to overcome these two challenges and achieve accurate measurements of T1 and T2 relaxation times from complex samples that contain crowded NMR resonances even under inhomogeneous magnetic fields. Both theoretical analyses and detailed experiments are performed to demonstrate the effectiveness and ability of the proposed method for accurate relaxation measurements on complex samples and its practicability to non-ideal magnetic field conditions.
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13

ARABEI, S. M., K. N. SOLOVYOV et G. D. EGOROVA. « Quasi-line phosphorescence spectra of the copper complex of meso-tetrapropylporphin at liquid helium temperature ». Journal of Porphyrins and Phthalocyanines 04, no 06 (septembre 2000) : 605–10. http://dx.doi.org/10.1002/1099-1409(200009/10)4:6<605 ::aid-jpp223>3.0.co;2-s.

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Quasi-line spectra of the 4 T 1→2 S 0 phosphorescence of Cu meso-tetrakis(n-propyl)porphin in n-octane at 4.2 K under wide-band and selective excitation have been obtained and analysed. A non-typically large distance between the edge components of the origin ‘multiplet’ (175 cm−1) indicating the sensitivity of the energy of the 0-0 transition of molecular impurity centres to the surroundings has been noted, which can lead to a significant inhomogeneous broadening in amorphous media. Two vibrations with frequencies of about 220 cm−1 are predominantly active in the phosphorescence spectrum. Unlike Cu porphin, the intensity of the corresponding quasi-lines is lower than the intensity of the 0-0 transition. From the broadening of the Q(0-0) band in the phosphorescence excitation spectrum at selective recording of the 0-0 quasi-line the lifetime of the level 2 S 1 (Q) has been determined as 35 fs.
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14

Kocharovskaya, Ekaterina, Alexey Mishin et Ivan Ryabinin. « Features of mode selection in a combined Fabry-Perot cavity with distributed feedback of counter-propagating waves ». ITM Web of Conferences 30 (2019) : 08009. http://dx.doi.org/10.1051/itmconf/20193008009.

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An analysis is made of the possibility of isolating relatively high-Q modes or groups of such modes in low-Q combined Fabry-Perot cavities with distributed feedback of counter-propagating waves in order to ensure resonant interaction of the electromagnetic field with the polarization oscillations of an amplifying or absorbing medium filling the cavity. We considered two-level active media with homogeneous or inhomogeneous broadening of a spectral line, which can be both smaller or larger than the photon bandgap of a cavity. Particular attention is paid to the change in the well-known spectrum of polariton modes which takes place due to the transition from an absorbing to an amplifying medium under conditions that allow the realization of spontaneous or laser generation of the so-called superradiant modes.
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15

Rodin, Victor V., Stephan J. Ginthör, Matthias Bechmann, Hervé Desvaux et Norbert Müller. « Spin noise gradient echoes ». Magnetic Resonance 2, no 2 (19 novembre 2021) : 827–34. http://dx.doi.org/10.5194/mr-2-827-2021.

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Abstract. Nuclear spin noise spectroscopy in the absence of radio frequency pulses was studied under the influence of pulsed field gradients (PFGs) on pure and mixed liquids. Under conditions where the radiation-damping-induced line broadening is smaller than the gradient-dependent inhomogeneous broadening, echo responses can be observed in difference spectra between experiments employing pulsed field gradient pairs of the same and opposite signs. These observed spin noise gradient echoes (SNGEs) were analyzed through a simple model to describe the effects of transient phenomena. Experiments performed on high-resolution nuclear magnetic resonance (NMR) probes demonstrate how refocused spin noise behaves and how it can be exploited to determine sample properties. In bulk liquids and their mixtures, transverse relaxation times and translational diffusion constants can be determined from SNGE spectra recorded following tailored sequences of magnetic field gradient pulses.
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16

Eremeev, Kirill, Pavel Loiko, Stanislav Balabanov, Timofey Evstropov, Dmitry Permin, Olga Postnikova, Valentin Petrov, Patrice Camy et Alain Braud. « Spectroscopy of thulium ions in solid-solution sesquioxide laser ceramics : Inhomogeneous spectral line broadening, crystal-field engineering and C3i sites ». Optical Materials 148 (février 2024) : 114791. http://dx.doi.org/10.1016/j.optmat.2023.114791.

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17

Ryzhov, I. V., E. S. Kovyneva et A. M. Devyatkov. « Superradiation in a Medium Consisting of Two Ultra-Thin Layers, Considering the Influence of Homogeneous and Inhomogeneous Spectral Line Broadening ». Bulletin of the Russian Academy of Sciences : Physics 88, no 6 (juin 2024) : 909–21. http://dx.doi.org/10.1134/s1062873824706810.

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18

Bales, Barney L., Kimberly L. Schumacher et Francis L. Harris. « Temperature dependence of the inhomogeneous line broadening in the EPR spectra of doxyl-labeled alkyl chains ». Journal of Physical Chemistry 91, no 7 (mars 1987) : 1701–2. http://dx.doi.org/10.1021/j100291a004.

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19

Pöppl, A., R. Böttcher et G. Völkel. « Inhomogeneous Line-Broadening Effects in1H Two-Dimensional Four-Pulse ESEEM Spectra of Betaine Phosphite Single Crystals ». Journal of Magnetic Resonance, Series A 120, no 2 (juin 1996) : 214–22. http://dx.doi.org/10.1006/jmra.1996.0117.

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20

Orlovskii, Yu V., T. T. Basiev, A. G. Papashvili, I. N. Vorob’ev, O. K. Alimov, V. V. Osiko et J. Heber. « Inhomogeneous broadening of the dynamically split Kramers spectral line and up-conversion in the pair and quartet centers in CaF2:Nd3+ ». Journal of Luminescence 99, no 3 (octobre 2002) : 223–36. http://dx.doi.org/10.1016/s0022-2313(02)00341-1.

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21

Zellner, Daniela, Andrea Varga et Martina Schwager. « Effect of Morphological Changes due Conductivity Enhancing Post Treatment on the Absorption and Photoluminescence of AgNW Thin Films ». Journal of Nano Research 81 (22 décembre 2023) : 9–20. http://dx.doi.org/10.4028/p-aiihp6.

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The effect of electrical and thermal treatment on silver nanowire (AgNW) network morphology and its impact on ultraviolet-visible (UV/Vis) and luminescence spectra is reported. The results exhibit that the conductivity enhancing welding of the single AgNWs at connection points changes the network morphology towards an increased proportion of spherical like structures. This inhomogeneity which is particularly noticeable for joule heated films not only gives rise to an inhomogeneous line broadening in absorption and luminescence spectra but also causes a red shift of the surface plasmon resonances in comparison to a non post-treated AgNW network. With increasing inhomogeneity either due to welding or beginning degradation the d-sp interband excitation pathway is especially efficient for the decay of surface plasmons and shows the strong coupling of the corresponding exciting and emitting photons to the surface plasmon excitation.
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22

Хайдуков, Н. М., М. Н. Бреховских, Н. Ю. Кирикова, В. А. Кондратюк et В. Н. Махов. « Люминесценция ионов марганца и хрома в соединениях со структурой шпинели ». Оптика и спектроскопия 131, no 4 (2023) : 450. http://dx.doi.org/10.21883/os.2023.04.55547.56-22.

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Single-phase ceramic samples of MgAl2O4, ZnAl2O4 and LiAl5O8 spinels containing manganese or chromium ions have been synthesized by a high-temperature solid-state reactions method. It has been shown that the luminescence properties of the synthesized phosphors, in particular, the appearance of intense red luminescence from Mn4+ ions, as well as the magnitude of inhomogeneous line broadening in the luminescence spectra of Mn4+ и Cr3+ ions depend on the degree of cation inversion, which provides the charge compensation for stabilizing Mn4+ ions in the octahedral sites of the spinel structures upon the substitution of Al3+ ions, simultaneously resulting in disordered spinel crystal structures.
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23

Paulheim, A., C. Marquardt, H. Aldahhak, E. Rauls, W. G. Schmidt et M. Sokolowski. « Inhomogeneous and Homogeneous Line Broadening of Optical Spectra of PTCDA Molecules Adsorbed at Step Edges of Alkali Halide Surfaces ». Journal of Physical Chemistry C 120, no 22 (26 mai 2016) : 11926–37. http://dx.doi.org/10.1021/acs.jpcc.6b01956.

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Meissner, Axel, Paw Bloch, Eberhard Humpfer, Manfred Spraul et Ole Winneche Sørensen. « Reduction of Inhomogeneous Line Broadening in Two-Dimensional High-Resolution MAS NMR Spectra of Molecules Attached to Swelled Resins in Solid-Phase Synthesis ». Journal of the American Chemical Society 119, no 7 (février 1997) : 1787–88. http://dx.doi.org/10.1021/ja9630001.

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Minati, L., Giorgio Speranza, Yoann Jestin, Cristina Armellini, Andrea Chiappini, A. Chiasera, Maurizio Ferrari et G. C. Righini. « Structural and Spectroscopic Assessment of Er3+-Activated SiO2-HfO2 Glass Ceramics Planar Waveguides ». Advances in Science and Technology 55 (septembre 2008) : 56–61. http://dx.doi.org/10.4028/www.scientific.net/ast.55.56.

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Two series of xHfO2 - (100-x) SiO2 (x=10, 20, 30 mol%) glass-ceramics planar waveguides doped with 0.3 mol% Er3+ ions were prepared by the sol-gel route. A thermal treatment at 1000°C was applied to the second series of samples to nucleate HfO2 crystals. The waveguides were analyzed by X-ray photoelectron spectroscopy to study the effect of the Hf concentration and of the annealing on the material structure. XPS shows that in the first series of samples a Hf concentration threshold exists. Above this threshold the material undergoes a spinodal decomposition with formation of HfO2 rich domains. In the second series of samples the presence of thermal treatment lowers the concentration threshold so that the phase separation occurs also at a Hf concentration of 10%mol. In the waveguides where spinodal decomposition in present, the emission spectra from the Er3+ ions reveal a sensible narrowing of the 4I13/2 → 4I15/2 line. This demonstrates the presence of a crystalline environment for the Er3+ ions since the inhomogeneous broadening due to the disordered glassy network is suppressed. These results may have important implications for the fabrication of photonic devices with increased efficiency.
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26

Kooi, M. Eline, Jan P. J. Michels et Jan A. Schouten. « Calculation of the vibrational linewidth and line shape of Raman spectra using the relaxation function. II. Application to the mixture neon–nitrogen with inhomogeneous broadening due to concentration fluctuations ». Journal of Chemical Physics 112, no 3 (15 janvier 2000) : 1404–12. http://dx.doi.org/10.1063/1.480694.

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27

Kozlov, V. V., et N. N. Rosanov. « Simulation of a spectral inhomogeneous broadening ». Optics and Spectroscopy 116, no 6 (juin 2014) : 956–62. http://dx.doi.org/10.1134/s0030400x14060150.

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Sabarinathan, V., C. Vinod Chandran, S. Ramasamy et S. Ganapathy. « 119Sn Magic Angle Spinning NMR of Nanocrystalline SnO2 ». Journal of Nanoscience and Nanotechnology 8, no 1 (1 janvier 2008) : 321–28. http://dx.doi.org/10.1166/jnn.2008.18134.

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Nanocrystalline SnO2 samples of different grain sizes, prepared by inert gas condensation technique (IGCT) and chemical precipitation method and conforming to the tetragonal phase, have been studied by variable speed (3–10 kHz) 119Sn MAS NMR at 11.74 Tesla field. 119Sn solid-state NMR results show that the IGCT prepared samples have good crystallinity and phase purity compared to the samples prepared by the chemical method. The determination of 119Sn chemical shielding parameters (δiso, Δδ and η) from slow MAS spectra shows that the 119Sn isotropic chemical shift (δiso) is strongly influenced at smaller grain sizes, attributable to the change in the O2− local symmetry for the surface 119Sn ions at smaller grain sizes. The observed line widths in MAS spectra are significantly larger than the life-time broadening due to spin–lattice (T1) and spin–spin (T2) relaxation. The 119Sn MAS NMR spectra are thus inhomogeneously broadened by a distribution of isotropic chemical shifts, the line broadening increasing with decrease in grain size.
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Kunc, Jan, et Martin Rejhon. « Raman 2D Peak Line Shape in Epigraphene on SiC ». Applied Sciences 10, no 7 (30 mars 2020) : 2354. http://dx.doi.org/10.3390/app10072354.

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We measured a 2D peak line shape of epitaxial graphene grown on SiC in high vacuum, argon and graphene prepared by hydrogen intercalation from the so called buffer layer on a silicon face of SiC. We fitted the 2D peaks by Lorentzian and Voigt line shapes. The detailed analysis revealed that the Voigt line shape describes the 2D peak line shape better. We have determined the contribution of the homogeneous and inhomogeneous broadening. The homogeneous broadening is attributed to the intrinsic lifetime. Although the inhomogeneous broadening can be attributed to the spatial variations of the charge density, strain and overgrown graphene ribbons on the sub-micrometer length scales, we found dominant contribution of the strain fluctuations. The quasi free-standing graphene grown by hydrogen intercalation is shown to have the narrowest linewidth due to both homogeneous and inhomogeneous broadening.
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Macfarlane, R. M. « Inhomogeneous broadening of spectral lines in doped insulators ». Journal of Luminescence 45, no 1-6 (janvier 1990) : 1–5. http://dx.doi.org/10.1016/0022-2313(90)90089-t.

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31

XIAO, YANHONG. « SPECTRAL LINE NARROWING IN ELECTROMAGNETICALLY INDUCED TRANSPARENCY ». Modern Physics Letters B 23, no 05 (20 février 2009) : 661–80. http://dx.doi.org/10.1142/s0217984909019028.

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Electromagnetically induced transparency (EIT) can make an otherwise opaque medium transparent by utilizing quantum coherence. EIT has attracted great interest since the 1990s for its wide applications in metrology, nonlinear and quantum optics, and quantum information science. We present a review on spectral line narrowing mechanisms in EIT-related systems, accounting for linewidths much narrower than expected from the standard mechanisms of Doppler broadening, transit time broadening, magnetic field inhomogeneity and power broadening. Topics covered include Dicke narrowing, atomic-motion-induced Ramsey narrowing, motional narrowing, density narrowing, laser induced narrowing and power-broadening-free resonance. Intuitive pictures are provided to describe the essential physics of each mechanism.
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32

Dimitrijevic, Milan S., et Sylvie Sahal-Brechot. « STARK BROADENING OF SPECTRAL LINE SHAPES ». High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes) 7, no 3 (2003) : 313–18. http://dx.doi.org/10.1615/hightempmatproc.v7.i3.40.

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33

Omar, Banaz. « Spectral Line Broadening in Dense Plasmas ». Journal of Atomic, Molecular, and Optical Physics 2011 (3 mai 2011) : 1–8. http://dx.doi.org/10.1155/2011/850807.

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Spectral line broadening is calculated based on a microscopic quantum statistical approach. By using thermodynamic Green's function, plasma correlation effect, electrostatic and dynamic screening, and perturber-radiator interaction are taken into account. Ions are treated in quasistatic approximation due to Stark effect. The line broadening for 6678 Å (21P-31D) and 5016 Å (21S-31P) transitions of neutral helium is calculated in the electron density range ne=(0.25–50)×1022 m-3 and temperature range T=(0.5–4)×104 K, and the density and temperature dependence of the line width are investigated. A good agreement is shown by comparing the calculated values with the existing experimental and theoretical data.
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Visschers, Ronald W., Frank van Mourik, René Monshouwer et Rienk van Grondelle. « Inhomogeneous spectral broadening of the B820 subunit form of LH1 ». Biochimica et Biophysica Acta (BBA) - Bioenergetics 1141, no 2-3 (mars 1993) : 238–44. http://dx.doi.org/10.1016/0005-2728(93)90048-k.

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Berberan-Santos, Mario N., Jacques Pouget, Bernard Valeur, Josette Canceill, Ludovic Jullien et Jean Marie Lehn. « Multichromophoric cyclodextrins. 2. Inhomogeneous spectral broadening and directed energy hopping ». Journal of Physical Chemistry 97, no 44 (novembre 1993) : 11376–79. http://dx.doi.org/10.1021/j100146a006.

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Liu, Albert. « Measuring Exciton Fine-Structure in Randomly Oriented Perovskite Nanocrystal Ensembles Using Nonlinear Optical Spectroscopy : Theory ». Nanomaterials 12, no 5 (26 février 2022) : 801. http://dx.doi.org/10.3390/nano12050801.

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Lead halide perovskite nanocrystals (PNCs) exhibit unique optoelectronic properties, many of which originate from a purported bright-triplet exciton fine-structure. A major impediment to measuring this fine-structure is inhomogeneous spectral broadening, which has limited most experimental studies to single-nanocrystal spectroscopies. It is shown here that the linearly polarized single-particle selection rules in PNCs are preserved in nonlinear spectroscopies of randomly oriented ensembles. Simulations incorporating rotational averaging demonstrate that techniques such as transient absorption and two-dimensional coherent spectroscopy are capable of resolving exciton fine-structure in PNCs, even in the presence of inhomogeneous broadening and orientation disorder.
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Taj, Skandar, Diane Baird, Alexander Rosu-Finsen et Martin R. S. McCoustra. « Surface heterogeneity and inhomogeneous broadening of vibrational line profiles ». Physical Chemistry Chemical Physics 19, no 11 (2017) : 7990–95. http://dx.doi.org/10.1039/c6cp07530d.

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The surface heterogeneity of amorphous silica (aSiO2) has been probed using coverage dependent temperature programmed desorption (TPD) of a simple probe molecule, carbon monoxide (CO), and is used to explain the inhomogeneous broadening of the CO stretching vibration in the infrared.
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Vyaselev, O. M., N. N. Kolesnikov, M. P. Kulakov et I. F. Schegolev. « Inhomogeneous 205Tl NMR line broadening in Tl2Ba2CuOx single crystals ». Physica C : Superconductivity 200, no 3-4 (octobre 1992) : 434–36. http://dx.doi.org/10.1016/0921-4534(92)90398-v.

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Taj, Skandar, Diane Baird, Alexander Rosu-Finsen et Martin R. S. McCoustra. « Correction : Surface heterogeneity and inhomogeneous broadening of vibrational line profiles ». Physical Chemistry Chemical Physics 21, no 38 (2019) : 21663–64. http://dx.doi.org/10.1039/c9cp90226k.

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Seaton, M. J. « Free-free transitions and spectral-line broadening ». Journal of Physics B : Atomic, Molecular and Optical Physics 33, no 14 (3 juillet 2000) : 2677–704. http://dx.doi.org/10.1088/0953-4075/33/14/306.

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Peraiah, A., et M. Srinivasa Rao. « Compton broadening effect on spectral line formation ». Astrophysics and Space Science 343, no 1 (18 septembre 2012) : 195–211. http://dx.doi.org/10.1007/s10509-012-1233-0.

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Ludwig, H. G. « 3D spectral synthesis and rotational line broadening ». Astronomy & ; Astrophysics 471, no 3 (26 juin 2007) : 925–27. http://dx.doi.org/10.1051/0004-6361:20066909.

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Frolov, Valeri P., Andrey A. Shoom et Christos Tzounis. « Spectral line broadening in magnetized black holes ». Journal of Cosmology and Astroparticle Physics 2014, no 07 (31 juillet 2014) : 059. http://dx.doi.org/10.1088/1475-7516/2014/07/059.

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Uenoyama, Takeshi. « Optical Gain Spectra in InGaN/GaN Quantum Wells with the Compositional Fluctuations ». MRS Internet Journal of Nitride Semiconductor Research 4, S1 (1999) : 112–17. http://dx.doi.org/10.1557/s1092578300002313.

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The compositional fluctuations of the In content were found in InGaN/GaN quantum wells and it caused the localized states by the potential fluctuation. We have evaluated the optical gain of GaN based quantum well structures with localized states. The localized states are treated as the subband states of the quantum disk-like dots in the well. It was found that the inhomogeneous broadening played an important role in the optical gain and that it should be reduced to use the benefit of the localized states for laser oscillations.
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Feautrier, N. « Working Group 4 : Line Broadening ». Transactions of the International Astronomical Union 20, no 1 (1988) : 128–34. http://dx.doi.org/10.1017/s0251107x00007082.

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There has been quite a renewal of interest in the field of line broadening during the last three years and the proceedings of the Eight International Conference on Spectral Line Shapes (1) showed the general state of progress of this topic. It is not the purpose of this report to be exhaustive, so we will simply give a number of useful results for astrophysical purposes and indicate some new fascinating directions in this research theme.
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Ormos, P., A. Ansari, D. Braunstein, B. R. Cowen, H. Frauenfelder, M. K. Hong, I. E. Iben, T. B. Sauke, P. J. Steinbach et R. D. Young. « Inhomogeneous broadening in spectral bands of carbonmonoxymyoglobin. The connection between spectral and functional heterogeneity ». Biophysical Journal 57, no 2 (février 1990) : 191–99. http://dx.doi.org/10.1016/s0006-3495(90)82522-4.

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MASUMOTO, YASUAKI. « PERSISTENT SPECTRAL HOLE-BURNING IN SEMICONDUCTOR QUANTUM DOTS ». Surface Review and Letters 03, no 01 (février 1996) : 143–50. http://dx.doi.org/10.1142/s0218625x96000292.

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The persistent spectral hole-burning (PSHB) phenomenon was observed in semiconductor quantum dots, CdSe , CuCl , and CuBr , embedded in glass and crystal. In inhomogeneously broadened exciton absorption spectra of these dots, the narrow bleaching hole and its associated structure are made by the narrowband laser excitation and are conserved for more than several hours at 2 K after the laser irradiation. The observation of the PSHB phenomenon in these four kinds of samples shows the generality of the phenomenon in semiconductor quantum dots and requires the existence of more than one ground-state configurations of the total system consisting of quantum dots and surrounding matrix. It means that not only the size distribution but also these ground-state configurations give inhomoge-neous broadening to semiconductor quantum dots. Thermally annealing and light-induced hole-filling phenomena were observed. Hole-burning and hole-filling mechanisms are discussed. Quantum dots consisting of 103–104 atoms behave like molecules or ions in matrix to give the PSHB phenomenon.
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Tomin, V. I., K. Hubisz et Z. Mudryka. « Anomalous Inhomogeneous Broadening of Electronic Spectra of Molecules with Internal Charge Transfer ». Zeitschrift für Naturforschung A 58, no 9-10 (1 octobre 2003) : 529–36. http://dx.doi.org/10.1515/zna-2003-9-1009.

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Excited states with internal charge transfer of some molecules show an anomalously strong inhomogeneous broadening of their electronic spectra. Here such an inhomogeneous broadening for N, N-dimethylaminobenzonithrile (DMABN) was studied. The spectral inhomogeneity for DMABN in some polar solvents reaches 140 - 150 nm.The interpretation of the obtained results is based on treating a solution as a set of chemically identical solvates with a luminophor molecule in the centre, having different energies of the pure electronic transitions. The inhomogeneity arises due to an intermolecular effect of the luminophors environment on its spectra in polar solvents, as well as a process of intramolecular movement of the twisting fragments relative to the main moiety of DMABN.
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Loco, Daniele, Sandro Jurinovich, Lorenzo Cupellini, Maximilian F. S. J. Menger et Benedetta Mennucci. « The modeling of the absorption lineshape for embedded molecules through a polarizable QM/MM approach ». Photochemical & ; Photobiological Sciences 17, no 5 (2018) : 552–60. http://dx.doi.org/10.1039/c8pp00033f.

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Burkett, W. H., Yong-qing Li et Min Xiao. « Inhomogeneous broadening-dependent spectral features in a four-level atomic system ». Journal of the Optical Society of America B 17, no 2 (1 février 2000) : 293. http://dx.doi.org/10.1364/josab.17.000293.

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