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Search Results (2)

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Journal = Physchem
Section = Application of Lasers to Physical Chemistry

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16 pages, 5587 KiB  
Article
Rotational vs. Vibrational Excitations in a Chemical Laser
by José Daniel Sierra Murillo
Physchem 2025, 5(3), 26; https://doi.org/10.3390/physchem5030026 - 4 Jul 2025
Viewed by 246
Abstract
The research reviews and contrasts two studies based on the gas-phase reaction OH + D2(v, j). In these studies, Quasi-Classical Trajectory (QCT) calculations and the Gaussian Binning (GB) technique were used on the Wu–Schatz–Lendvay–Fang–Harding (WSLFH) potential energy surface. Large sample sizes [...] Read more.
The research reviews and contrasts two studies based on the gas-phase reaction OH + D2(v, j). In these studies, Quasi-Classical Trajectory (QCT) calculations and the Gaussian Binning (GB) technique were used on the Wu–Schatz–Lendvay–Fang–Harding (WSLFH) potential energy surface. Large sample sizes allow for precise energy state distribution analysis across translational, vibrational, and rotational components in the products. A key observation is the influence of the vibrational and rotational excitation of D2 on the total angular momentum (J′) of the HOD* product. This study reveals that increasing the vibrational level, vD2, significantly shifts P(J′) distributions toward higher values, broadening them due to increased isotropy. In contrast, increasing the rotational level, jD2, results in a smaller shift but introduces greater anisotropy, leading to a more selective distribution of J′ values. The dual Gaussian Binning selection—Vibrational-GB followed by Rotational-GB—further highlights a preference for either odd or even J′ values, depending on the specific excitation conditions. These findings have implications for the development of chemical lasers, as the excitation and emission properties of HOD* can be leveraged in the laser design. Future research aims to extend this study to a broader range of initial conditions, refining the understanding of reaction dynamics in controlled gas-phase environments. Full article
(This article belongs to the Section Application of Lasers to Physical Chemistry)
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42 pages, 6472 KiB  
Article
Measurement Precision and Thermal and Absorption Properties of Nanostructures in Aqueous Solutions by Transient and Steady-State Thermal-Lens Spectrometry
by Vladislav R. Khabibullin, Liliya O. Usoltseva, Polina A. Galkina, Viktoriya R. Galimova, Dmitry S. Volkov, Ivan V. Mikheev and Mikhail A. Proskurnin
Physchem 2023, 3(1), 156-197; https://doi.org/10.3390/physchem3010012 - 9 Mar 2023
Cited by 13 | Viewed by 4052
Abstract
A simultaneous steady-state and transient photothermal-lens modality was used for both the thermal and optical parameters of aqueous dispersed systems (carbon and silica nanoparticles, metal iodides, surfactants, heme proteins, albumin, and their complexes). Heat-transfer parameters (thermal diffusivity and thermal effusivity), the temperature gradient [...] Read more.
A simultaneous steady-state and transient photothermal-lens modality was used for both the thermal and optical parameters of aqueous dispersed systems (carbon and silica nanoparticles, metal iodides, surfactants, heme proteins, albumin, and their complexes). Heat-transfer parameters (thermal diffusivity and thermal effusivity), the temperature gradient of the refractive index, light absorption, and concentration parameters were assessed. To simultaneously measure thermal and optical parameters, the time scale of thermal lensing (characteristic time, tc) should correspond to an excitation beam size of 60–300 µm, and the relative time intervals 0.5÷5tc and (5÷20)tc should be selected for transient and steady-state measurements, respectively. Dual-beam thermal-lens spectrometers in a mode-mismatched optical schematic at various excitation wavelengths were built. The spectrometers implement back-synchronized detection, providing different measurement conditions for the heating and cooling parts of the thermal-lens cycle. By varying the measurement parameters depending on the dispersed system, the conditions providing the suitable precision (replicability, repeatability, and reproducibility) of thermal-lens measurements were found; setups with a broad excitation beam (waist size, 150 and 300 μm) provide longer times to attain a thermal equilibrium and, thus, the better precision of measurements of thermal diffusivity. Full article
(This article belongs to the Section Application of Lasers to Physical Chemistry)
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