Academic Journal
Emission characteristics and dynamics of neutral, ionic and molecular species in a laser produced CaF2 plasma
| العنوان: | Emission characteristics and dynamics of neutral, ionic and molecular species in a laser produced CaF2 plasma |
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| المؤلفون: | Oujja, Mohamed, Juan Camacho, Joaquín, Paradela, D., Castillejo, Marta, de Nalda, Rebeca |
| المساهمون: | UAM. Departamento de Química Física Aplicada |
| بيانات النشر: | Elsevier Ltd |
| سنة النشر: | 2024 |
| المجموعة: | Universidad Autónoma de Madrid (UAM): Biblos-e Archivo |
| مصطلحات موضوعية: | Laser produced plasma, time- and space-resolved optical emission spectroscopy, electron density, electron temperature, calcium fluoride, Química |
| الوصف: | The emission characteristics of a laser-ablated calcium fluoride CaF2 plasma have been investigated using time and space optical emission spectroscopy. The plasma-plume was produced by focusing 266 nm, 15 ns pulses from a Nd: YAG laser on a calcium fluoride crystal substrate placed in a vacuum chamber. The emission observed in the plasma region is due to electronic relaxation of excited neutral Ca and F, ionic fragments Ca2+, Ca+ and F+ and molecular features of CaF (A2Π- X2Σ+, B2Σ+- X2Σ+ and C2Π- X2Σ+) band systems. Plasma species were analyzed both as a function of the delay from the laser pulse incidence and location from the target surface. Spectroscopic diagnostics were employed to estimate time-resolved electron densities, electron temperatures and velocity expansion of different species. The results show a faster decay of the continuum emission, ionic F+, Ca2+, Ca+, F species than in the case of neutral Ca atoms and molecular species of CaF. Different excitation temperatures were measured by comparing Ca and F atomic/ionic Saha-local thermodynamic equilibrium (LTE) spectra with experimental ones at various delay times after the ablation event. Vibrational temperatures of CaF were assessed from the temporal analysis of the A2Π - X2Σ+ Δv = 0 band sequence molecular emission. We observed a non-equilibrium plasma although the plasma is found to maintain partial LTE ; This research was supported by the Spanish State Research Agency (AEI) and the European Regional Development (FEDER) through Projects PID2019-104124RB-I00/AEI/10.13039/501100011033 and PID2019-106125GB-I00/AEI/10.13039/501100011033 ; the European H2020 IPERION HS Project (Integrated Platform for the European Research Infrastructure ON Heritage Science ( GA 871034, WP5 )); TOP Heritage-CM ( S2018/NMT-4372 ) project from the Community of Madrid and with the support of Plataforma Temática Interdisciplinar of CSIC “Patrimonio Abierto: Investigación y Sociedad” (PTI-PAIS) |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | Journal of Quantitative Spectroscopy and Radiative Transfer; https://doi.org/10.1016/j.jqsrt.2021.107924; Gobierno de España. PID2019-104124RB-I00; Gobierno de España. PID2019-106125GB-I00; Comunidad de Madrid. 2018/NMT-4372/TOPHERITAGE; Journal of Quantitative Spectroscopy and Radiative Transfer 276 (2021): 107924; http://hdl.handle.net/10486/717044; 276 |
| DOI: | 10.1016/j.jqsrt.2021.107924 |
| الاتاحة: | http://hdl.handle.net/10486/717044 https://doi.org/10.1016/j.jqsrt.2021.107924 |
| Rights: | © 2021 The Author(s) ; http://creativecommons.org/licenses/by/4.0/ ; Reconocimiento ; openAccess |
| رقم الانضمام: | edsbas.DFCAFF5D |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.jqsrt.2021.107924 |
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