Journal of Applied Spectroscopy最新文献

{"title":"Quantitative Modeling of Electron Acceleration in Laguerre-Gaussian Laser Fields","authors":"M. S. Hariprasad,&nbsp;J. Rajput","doi":"10.1007/s10812-026-02106-0","DOIUrl":"10.1007/s10812-026-02106-0","url":null,"abstract":"<p>The use of Laguerre-Gaussian (LG) laser beams in particle acceleration provides a promising pathway for advancing laser-driven acceleration schemes. We investigate electron acceleration resulting from the interaction of LG beams with charged particles. A comprehensive theoretical framework is formulated to elucidate the underlying acceleration mechanisms, complemented by detailed numerical simulations. The electron dynamics in the structured electromagnetic fields of the LG beam are systematically analyzed, revealing distinctive acceleration behavior along the direction of beam propagation. Our results demonstrate that the orbital angular momentum and spatial field structure of LG beams enable controlled and efficient electron acceleration. These findings highlight the potential of LG beams as a viable tool for tailored electron acceleration and contribute to the broader development of advanced laser-plasma and laser-based acceleration techniques.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"683 - 689"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Calculations of the Energy of the Triplet 5sns(3S1), 5snd(3D1,2) and the Singlet 5snd(1D2) States of the Rydberg Series of the Strontium Atom Using the Screening Constants Per Unit Nuclear Charge Method","authors":"Papa Mamadou Ndiaye,&nbsp;Abdou Faye,&nbsp;Malick Sow,&nbsp;Moustapha Kebe,&nbsp;Cheikh Ndiaye,&nbsp;Oumar Baba Dia,&nbsp;Oumar Absatou Niasse","doi":"10.1007/s10812-026-02097-y","DOIUrl":"10.1007/s10812-026-02097-y","url":null,"abstract":"<p>We report calculations of accurate high-lying resonance energies of the triplet and the singlet states of the strontium Rydberg series. Calculations are performed using the Screening Constant by Unit Nuclear Charge (SCUNC) method from n = 12 to 60. This semi-empirical method is widely used in atomic physics to predict energies of excited states without requiring calculation of photoionization cross sections. Present results are compared with the existing NIST database of Kramidal and Advanced Light Source measurements of Couturier et al. Analysis of the present results is achieved in the framework of the standard quantum-defect theory of the SCUNC procedure. In addition, the present work demonstrates the strength of the SCUNC formalism to assist experimenters in the analysis of measurements.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"605 - 618"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Role of Heat-treatment Environment in Color Changes of Natural Gemstones Using Zircon, Andradite, and Cassiterite as Examples","authors":"E. A. Akhmetshin,&nbsp;I. A. Klimkin,&nbsp;O. B. Petrova","doi":"10.1007/s10812-026-02091-4","DOIUrl":"10.1007/s10812-026-02091-4","url":null,"abstract":"<p>Color changes of the natural gemstones zircon, andradite, and cassiterite during their heat treatment in various media have been studied. Initially almost black zircons turned pale-yellow after heating at 1100°C under oxidizing conditions (air oxygen); bright blue, at the same temperature under reducing conditions (carbon monoxide). Color reversibility in addition to such contrasting color changes was also noted in andradite, depending on the heat treatment medium. Crystals in a repeated series of experiments at the same temperature (830°C) in air turned light brown; in the presence of a reducing agent, returned to a saturated green color. Thus, the key factor determining the observed color changes was the heating medium.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"564 - 569"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photoluminescence of Highly Compensated Cu2ZnSnSe4 Compound with the Kesterite Structure","authors":"V. D. Zhivulko,&nbsp;A. V. Mudryi,&nbsp;O. M. Borodavchenko,&nbsp;K. V. Usenko,&nbsp;E. V. Lutsenko,&nbsp;V. N. Pavlovskii,&nbsp;G. P. Yablonskii,&nbsp;M. V. Yakushev","doi":"10.1007/s10812-026-02090-5","DOIUrl":"10.1007/s10812-026-02090-5","url":null,"abstract":"<p>The optical width of the direct band gap of thin films of the Cu₂ZnSnSe₄ compound with the kesterite structure was determined to be E_g ≈ 1.052 eV at a temperature of 6 K based on photoluminescence (PL) and PL excitation spectra. The mechanisms of radiative recombination of nonequilibrium charge carriers in the temperature range 6–300 K were established. These mechanisms determined the appearance of broad PL bands in the energy region 0.7–1.1 eV. Redistribution of intensity between radiative recombination channels in the spectral region 0.93–0.99 eV was detected for the direct-gap compound Cu₂ZnSnSe₄ with p-type conductivity, indicating the presence of deep acceptor and donor levels in the band gap. The thermal activation energy of nonradiative recombination channels involving structural defects was determined based on intensity quenching of broad PL bands in the energy range 0.7–1.0 eV. Their nature was discussed.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"556 - 563"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physical Mechanism of Diffraction and Mixing of Light Waves by a Phase-Absorption Holographic Grating in a Cubic Photorefractive Crystal","authors":"V. N. Naunyka","doi":"10.1007/s10812-026-02095-0","DOIUrl":"10.1007/s10812-026-02095-0","url":null,"abstract":"<p>The physical mechanism of reconstruction and amplification of an object wave upon diffraction of a reference wave by a sinusoidal phase-absorption holographic grating formed in a cubic optically active photorefractive crystal was studied. The vector amplitude of the reconstructed wave was found in the framework of the proposed analytical approach as the resulting sum of oscillations of diffracted waves of variable amplitude emitted by thin layers of the holographic grating. The polarization condition under which the diffraction efficiency of the hologram and intensity transfer during two-wave mixing reached maximum values was formulated. The dependences of the output energy characteristics of the phase-absorption hologram on the crystal thickness calculated using the analytical approach were shown to agree with data obtained by solving coupled-waves equations.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"588 - 595"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and Validation of an Ultraviolet Spectroscopic Technique for Determination of Solubility of Xanthohumol in Bulk and in Formulation","authors":"Nikita Kaushik,&nbsp;Neelam Sharma","doi":"10.1007/s10812-026-02109-x","DOIUrl":"10.1007/s10812-026-02109-x","url":null,"abstract":"<p>The goal of the present investigation was to develop a simple, accurate, precise, robust, and cost-effective UV-spectroscopic technique for the quantitative estimation of xanthohumol in bulk and hydrogel, in accordance with the International Conference on Harmonisation guidelines. The λ_max of xanthohumol was found to be 363 nm with <i>y</i> = 0.06363<i>x</i> + 0.0115 as the regression equation, a 0.9968 regression coefficient, and showed linearity in the range 2–14 μg/mL. Relative standard deviation (%RSD) values for intraday analysis were 1.105, 0.936, and 0.32, whereas for interday analysis, these values were 1.312, 0.433, and 0.979 (&lt;2% RSD). RSD for absorbance values analyzed using different spectrophotometers was 0.886 and 1.242%, and by different analysts it was 0.647 and 1.044% (&lt;2% RSD), which validated the ruggedness parameter. RSDs for absorbance values analyzed at 361, 363, and 365 nm were 0.761, 1.045, and 0.885%, respectively (RSD &lt; 2%), indicating robustness. The mean recovery of xanthohumol in the presence of carbopol-934 was in the range 98–102%, which validated its specificity. The limit of detection (LOD), limit of quantitation (LOQ), and Sandell’s index for xanthohumol were 0.639, 1.939 μg/mL, and 0.017278 μg/cm² per 0.001 absorbance unit respectively, indicating higher sensitivity of the analytical method for xanthohumol detection. Xanthohumol-loaded carbopol-934 hydrogel was formulated by dispersing xanthohumol in carbopol-934 and neutralizing it with triethanolamine. The solubility of the bulk form of xanthohumol in phosphate buffer at pH 6.8 was 1.153 μg/mL, which was enhanced to 4.12 μg/mL by the production of xanthohumol-loaded Carbopol hydrogel.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"705 - 713"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and Validation of UV Spectrophotometric Methods for the Simultaneous Estimation of Sitagliptin and Gliclazide in Pharmaceutical Formulations: A Statistical Comparison Using Anova","authors":"M. Absher,&nbsp;S. V. Kutty,&nbsp;S. A. Surendran,&nbsp;Y. Haribabu,&nbsp;A. Hassanar,&nbsp;A. Ashokan,&nbsp;A. Aravind,&nbsp;D. V. Santhosh","doi":"10.1007/s10812-026-02110-4","DOIUrl":"10.1007/s10812-026-02110-4","url":null,"abstract":"<p>This study describes the development and validation of two UV-visible spectrophotometric methods for the simultaneous quantification of sitagliptin phosphate monohydrate and gliclazide in fixed-dose pharmaceutical formulations. The combination, which was recently approved by the Central Drugs Standard Control Organization (CDSCO) in 2023, is used in the management of type 2 diabetes owing to its complementary pharmacological mechanisms and favorable safety profile. Spectrophotometry was selected as a simple, cost-eff ective yet reliable alternative to chromatographic techniques for routine quality-control analysis. Two methods — simultaneous equations and first derivatives — were developed using HPLC-grade methanol as a solvent and analyzed with a Shimadzu UV- 1800 double-beam spectrophotometer. Method validation was conducted in accordance with International Council for Harmonization of Technical Requirements for Pharmaceuticals for Human Use (ICH) Q2(R2) guidelines. The methods demonstrated excellent linearity across the concentration ranges of 8–56 μg/mL for sitagliptin and 4.8–33.4 μg/mL for gliclazide, with correlation coefficients exceeding 0.999. Accuracy studies yielded recovery within acceptable limits, and precision was confirmed by low relative standard deviations. The first-order derivative method utilized zero-crossing wavelengths of 213.2 nm (sitagliptin) and 243.6 nm (gliclazide), whereas the simultaneousequation method used λ_max values of 268.0 and 228.4 nm, respectively. Both methods showed high sensitivity (limit of detection, limit of quantitation), reproducibility, and robustness. Statistical comparison using one-way ANOVA revealed no significant diff erence (p &gt; 0.05) compared with previously reported methods, confirming analytical equivalence. These validated methods are suitable for routine quality assessment and regulatory compliance of combined formulations, with future applicability in biological matrices.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"714 - 726"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accumulation and Visualization of Boron-nitride Nanoparticles in Glioma Cells","authors":"A. V. Bahdanava,&nbsp;E. I. Venskaya,&nbsp;L. M. Lukyanenko,&nbsp;E. V. Shamova,&nbsp;T. A. Kulahava","doi":"10.1007/s10812-026-02093-2","DOIUrl":"10.1007/s10812-026-02093-2","url":null,"abstract":"<p>The hydrothermal synthesis of biocompatible, fluorescent boron-nitride nanoparticles (BNNPs) was performed. The BNNPs accumulated in C6 rat glioma cells and were visualized upon irradiation at 365 nm. The efficiency of BNNP internalization by cells was found to depend on the incubation time and medium parameters. BNNPs at concentrations up to 1 mg/mL were promising for use in bioimaging and boron neutron capture therapy because they had no cytotoxic effect on the cells.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"576 - 581"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction of Methodological Inaccuracy in a Two-beam Coupling Experiment","authors":"A. V. Agashkov","doi":"10.1007/s10812-026-02096-z","DOIUrl":"10.1007/s10812-026-02096-z","url":null,"abstract":"<p>An analysis of experimental studies on two-beam coupling (2BC) revealed that the conclusions about establishing the photorefractive properties of the studied gratings based on the asymmetric temporal fluctuations of the output beams are methodologically inaccurate. In fact, the studies compared the output beams of a Mach–Zehnder interferometer, in which the grating itself served as the output beam splitter. Comparative experimental studies using a conventional phase surface holographic grating and a photorefractive grating formed in a liquid crystal cell fully confirmed the results of the analysis. It was shown that the inclusion of a chopper, periodically switching on and off one of the incident beams, and a phase modulator for alternating harmonic change of the phase shift between the beams in the standard 2BC set-up ensured the correct establishment of the photorefractive properties of the studied grating.</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"596 - 604"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Luminescent Properties of Co-Doped Complexes of Eu(III)–Tb(III) with 2,4,6-Pyridinetricarboxylate","authors":"Hongsheng Wang,&nbsp;Hui Li,&nbsp;Xueying Hu,&nbsp;Shumin Shan","doi":"10.1007/s10812-026-02100-6","DOIUrl":"10.1007/s10812-026-02100-6","url":null,"abstract":"<p>A series of Eu(III)-Tb(III) co-doped complexes was synthesized under hydrothermal conditions at 180°C by reacting europium(III) and terbium(III) perchlorates with 2,4,6-pyridinetricarboxylic acid (ptc) in systematically varied molar ratios. The molar ratios of Eu(III) to Tb(III) employed during synthesis were as follows: 1.0:0 (<b>1</b>), 0.9:0.1 (<b>2</b>), 0.8:0.2 (<b>3</b>), 0.7:0.3 (<b>4</b>), 0.6:0.4 (<b>5</b>), 0.5:0.5 (<b>6</b>), 0.4:0.6 (<b>7</b>), 0.3:0.7 (<b>8</b>), 0,2:0.8 (<b>9</b>), 0.1:0.9 (<b>10</b>), and 0:1.0 (<b>11</b>). The excitation and emission spectra, luminescence lifetimes, and quantum yields of the complexes were measured. Emission spectroscopy analysis revealed that under ultraviolet excitation, the luminescent color of the complexes gradually shifted from red to orange, yellow, and green as the Eu(III) content decreased and the Tb(III) content increased. Luminescence lifetime measurements showed that the pure Eu(III) complex (<b>1</b>) exhibited the shortest lifetime. In the co-doped complexes, the lifetime of the Eu(III) ⁵<i>D</i>₀ → ⁷<i>F</i>₂ transition gradually increased as the Eu(III) content decreased. Conversely, the pure Tb(III) complex (<b>11</b>) displayed the longest lifetime, and the lifetime of the Tb(III) ⁵<i>D</i>₄ → ⁷<i>F</i>₅ transition decreased rapidly as the Tb(III) content was reduced. Absolute quantum yield (QY) measurements indicated that the pure Eu(III) complex (<b>1</b>) had the lowest QY, whereas the pure Tb(III) complex (<b>11</b>) showed the highest. Among the co-doped complexes (<b>2</b>–<b>10</b>), the QY gradually increased with decreasing Eu(III) content, and correspondingly decreased with increasing Eu(III) content. These results suggest that in this series of complexes, Tb(III) can sensitize the luminescence of Eu(III), whereas Eu(III) exerts a quenching effect on the luminescence of Tb(III).</p>","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"635 - 641"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}