Article
Multidisciplinary Sciences
Jie Jiang, Lifu Zhang, Chen Ming, Hua Zhou, Pritom Bose, Yuwei Guo, Yang Hu, Baiwei Wang, Zhizhong Chen, Ru Jia, Saloni Pendse, Yu Xiang, Yaobiao Xia, Zonghuan Lu, Xixing Wen, Yao Cai, Chengliang Sun, Gwo-Ching Wang, Toh-Ming Lu, Daniel Gall, Yi-Yang Sun, Nikhil Koratkar, Edwin Fohtung, Yunfeng Shi, Jian Shi
Summary: This study experimentally investigated the pyroelectric behavior of three different pyroelectric materials at varying thicknesses. The results showed that the pyroelectric coefficient increased rapidly as the thickness of the free-standing sheets decreased. The study also found that materials with chemical bonds along the out-of-plane direction exhibited the greatest dimensionality effect on pyroelectricity.
Article
Chemistry, Physical
Pan Li, Sven H. C. Askes, Esther del Pino Rosendo, Freek Ariese, Charusheela Ramanan, Elizabeth von Hauff, Andrea Baldi
Summary: In this work, temperature measurements at the nanoscale were achieved by exploiting the combination of surface-enhanced Raman spectroscopy and the temperature dependence of Raman peaks in beta-CuPc. The temperature of plasmonic gold nanoparticles under laser irradiation was determined by measuring the temperature-dependent Raman shifts of beta-CuPc films coated on an array of Au nanodisks and using calibration curves. The extracted temperatures were confirmed to be consistent with numerical modeling results.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Optics
C. Boulet, Q. Ma
Summary: Calculations of the widths and temperature dependence of transitions in CH3I in the v(5) and v(6) bands have been made using a modified semi-classical line shape formalism. The results show good agreement with available data and propose new experiments to further investigate inter-doublet mixing effects.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Chemistry, Physical
Paul Cavanaugh, Xudong Wang, Maria J. Bautista, Ilan Jen-La Plante, David F. Kelley
Summary: This paper investigates the mechanisms responsible for the larger Stokes shifts and photoluminescence (PL) line widths in InP-based quantum dots (QDs) compared to II-VI semiconductor QDs with comparable exciton energies. The Stokes shift is found to decrease with different semiconductors, with InP having the largest shift, followed by CdTe and CdSe. The size of the QDs and the deposition of a ZnSe shell also affect the Stokes shift. The spectral widths are controlled by homogeneous and inhomogeneous broadening, with size inhomogeneity and core-shell interface inhomogeneity being the two types of inhomogeneous broadening.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Albert Liu, Gabriel Nagamine, Luiz G. Bonato, Diogo B. Almeida, Luiz F. Zagonel, Ana F. Nogueira, Lazaro A. Padilha, Steven T. Cundiff
Summary: Using multidimensional coherent spectroscopy, it was found that the line broadening mechanisms of perovskite nanoplatelets depend on platelet geometry, with decreasing thickness resulting in reduced line widths. Additionally, homogeneously broadened exciton resonances were observed in two-layer, but not necessarily three-layer, nanoplatelets at room temperature.
Article
Chemistry, Physical
A. M. Panich, A. E. Aleksenskii, E. B. Yudina, A. Ya Vul
Summary: We report a novel approach to determine the spatially resolved nuclear spin-lattice relaxation times and NMR line widths in nanomaterials. We applied this approach to detonation nanodiamonds with manganese ions grafted onto their surface and observed the acceleration of nuclear spin-lattice relaxation and broadening of the resonance line. By using spin dephasing experiments, we were able to determine the contribution of paramagnetic Mn2+ ions to the relaxation time and line width of carbon spins at different depths from the diamond surface. Developed specifically for nanodiamonds, this approach can be applied to study distribution of relaxation rates and line broadening, and map magnetic interactions inside various nanoparticles, making it valuable in nanotechnologies.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Jian Wang, Jing L. You, Xu P. Wang, Min Wang, Qing L. Zhang, Song M. Wan, Li M. Lu
Summary: In this study, in situ high temperature Raman spectra of KTaO3 crystal and melt were measured and analyzed. The relationship between Ta-O bond lengths and characteristic Raman-active vibration wavenumbers of the molten KTaO3 was investigated. The presence of a mixture of Ta-O anion complexes in the molten KTaO3 was confirmed, providing new insights into its microstructures during disproportionation equilibrium.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Michael D. Fayer, Sebastian M. Fica-Contreras, Aaron P. Charnay, Junkun Pan
Summary: This study investigates the vibrational transitions of benzonitrile and phenyl selenocyanate in different solvents using ultrafast spectroscopies. The first-order Stark effect is found to determine the vibration's transition frequency, while the line width is influenced by the solvent coupling contribution. Moreover, the difference in the Stark tuning rates of 0-* 1 and 1-* 2 transitions is examined theoretically and experimentally.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Optics
O. Ben Fathallah, L. Manceron, N. Dridi, M. Rotger, H. Aroui
Summary: In this study, broadening coefficients of methyl chloride were measured for N-2(-) and O-2 at specific wavenumber range using a high-resolution Fourier transform spectrometer. The experimental results showed an accuracy of around 7% and 17% for broadening and shift coefficients respectively, with comparisons made to previous measurements and semi-classical predictions.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Chemistry, Physical
Artem Musiienko, Jakub Cizek, Hassan Elhadidy, Petr Praus, Kate Higgins, Bogdan Dryzhakov, Andrii Kanak, Franck Sureau, Jindrich Pipek, Eduard Belas, Marian Betusiak, Mykola Brynza, Eric Lukosi, Bin Hu, Mahshid Ahmadi
Summary: The study found that both hybrid and all-inorganic MHPs exhibit low concentrations of vacancies regardless of their synthesis method, with crystals grown from solution prone to solvent inclusion during synthesis.
CHEMISTRY OF MATERIALS
(2022)
Article
Optics
O. N. Ulenikov, O. Gromova, E. S. Bekhtereva, N. Raspopova, E. A. Sklyarova, C. Sydow, K. Berezkin, C. Maul, S. Bauerecker
Summary: The study recorded high resolution infrared spectra of SiH4 in its natural abundance and analyzed specific bands in the 1600-2100 cm(-1) region. Effective dipole moment parameters and self-broadening coefficients of different isotopologues of silane were obtained through line strength analysis and multi-spectrum analysis.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Food Science & Technology
H. M. Hussain Khan, Ultan McCarthy, Karen Esmonde-White, Imelda Casey, Norah O'Shea
Summary: This study developed partial least squares regression models for the accurate measurement of fat, protein, and lactose components in raw milk using Raman spectroscopy.
Article
Nanoscience & Nanotechnology
Davoud Hejazi, Renda Tan, Neda Kari Rezapour, Mehrnaz Mojtabavi, Meni Wanunu, Swastik Kar
Summary: The study presents a simple method for synthesizing high-quality MoS2 monolayers with narrower and more uniform excitonic line widths and feature-rich Raman spectra. The method opens up new possibilities in the field of 2D materials research and provides a low-cost platform for advancing research in sensing, detection, and fundamental discoveries for scientists and engineers.
ACS APPLIED NANO MATERIALS
(2021)
Article
Astronomy & Astrophysics
Rihab Aloui, Haykel Elabidi, Sylvie Sahal-Brechot
Summary: In this study, the Stark widths of 87 spectral lines of strontium ions were calculated using a quantum-mechanical method. The calculations fill the gap in the existing database and provide valuable data for investigating stellar spectra. The results are expected to be useful for modeling stellar atmospheres.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Instruments & Instrumentation
Toru Katsumata, Nobuyuki Hanami, Hiroaki Aizawa
Summary: The study demonstrated that the brightness of a red photoluminescence (PL) image from a YAG:Cr crystal increases with temperature, which is related to the change in the peak area of the PL peaks.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)