Experimental measurements of the collisional absorption of XUV radiation in warm dense aluminium.
The collisional (or free-free) absorption of soft x rays in warm dense aluminium remains an unsolved problem. Competing descriptions of the process exist, two of which we compare to our experimental data here. One of these is based on a weak scattering model, another uses a corrected classical appro...
| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Physical Society
2016
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| _version_ | 1797059743439650816 |
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| author | Kettle, B Dzelzainis, T White, S Li, L Dromey, B Zepf, M Lewis, C Williams, G Künzel, S Fajardo, M Dacasa, H Zeitoun, P Rigby, A Gregori, G Spindloe, C Heathcote, R Riley, D |
| author_facet | Kettle, B Dzelzainis, T White, S Li, L Dromey, B Zepf, M Lewis, C Williams, G Künzel, S Fajardo, M Dacasa, H Zeitoun, P Rigby, A Gregori, G Spindloe, C Heathcote, R Riley, D |
| author_sort | Kettle, B |
| collection | OXFORD |
| description | The collisional (or free-free) absorption of soft x rays in warm dense aluminium remains an unsolved problem. Competing descriptions of the process exist, two of which we compare to our experimental data here. One of these is based on a weak scattering model, another uses a corrected classical approach. These two models show distinctly different behaviors with temperature. Here we describe experimental evidence for the absorption of 26-eV photons in solid density warm aluminium (T_{e}≈1 eV). Radiative x-ray heating from palladium-coated CH foils was used to create the warm dense aluminium samples and a laser-driven high-harmonic beam from an argon gas jet provided the probe. The results indicate little or no change in absorption upon heating. This behavior is in agreement with the prediction of the corrected classical approach, although there is not agreement in absolute absorption value. Verifying the correct absorption mechanism is decisive in providing a better understanding of the complex behavior of the warm dense state. |
| first_indexed | 2024-03-06T20:08:34Z |
| format | Journal article |
| id | oxford-uuid:29c1421f-17ca-4ef3-a5f1-871b7542ef0b |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:08:34Z |
| publishDate | 2016 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:29c1421f-17ca-4ef3-a5f1-871b7542ef0b2022-03-26T12:21:05ZExperimental measurements of the collisional absorption of XUV radiation in warm dense aluminium.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:29c1421f-17ca-4ef3-a5f1-871b7542ef0bEnglishSymplectic Elements at OxfordAmerican Physical Society2016Kettle, BDzelzainis, TWhite, SLi, LDromey, BZepf, MLewis, CWilliams, GKünzel, SFajardo, MDacasa, HZeitoun, PRigby, AGregori, GSpindloe, CHeathcote, RRiley, DThe collisional (or free-free) absorption of soft x rays in warm dense aluminium remains an unsolved problem. Competing descriptions of the process exist, two of which we compare to our experimental data here. One of these is based on a weak scattering model, another uses a corrected classical approach. These two models show distinctly different behaviors with temperature. Here we describe experimental evidence for the absorption of 26-eV photons in solid density warm aluminium (T_{e}≈1 eV). Radiative x-ray heating from palladium-coated CH foils was used to create the warm dense aluminium samples and a laser-driven high-harmonic beam from an argon gas jet provided the probe. The results indicate little or no change in absorption upon heating. This behavior is in agreement with the prediction of the corrected classical approach, although there is not agreement in absolute absorption value. Verifying the correct absorption mechanism is decisive in providing a better understanding of the complex behavior of the warm dense state. |
| spellingShingle | Kettle, B Dzelzainis, T White, S Li, L Dromey, B Zepf, M Lewis, C Williams, G Künzel, S Fajardo, M Dacasa, H Zeitoun, P Rigby, A Gregori, G Spindloe, C Heathcote, R Riley, D Experimental measurements of the collisional absorption of XUV radiation in warm dense aluminium. |
| title | Experimental measurements of the collisional absorption of XUV radiation in warm dense aluminium. |
| title_full | Experimental measurements of the collisional absorption of XUV radiation in warm dense aluminium. |
| title_fullStr | Experimental measurements of the collisional absorption of XUV radiation in warm dense aluminium. |
| title_full_unstemmed | Experimental measurements of the collisional absorption of XUV radiation in warm dense aluminium. |
| title_short | Experimental measurements of the collisional absorption of XUV radiation in warm dense aluminium. |
| title_sort | experimental measurements of the collisional absorption of xuv radiation in warm dense aluminium |
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