Non-thermal desorption/ablation of molecular solids induced by ultra-short soft x-ray pulses
Jazyk angličtina Země Spojené státy americké Médium print
Typ dokumentu časopisecké články, práce podpořená grantem, Research Support, U.S. Gov't, Non-P.H.S.
PubMed
19129890
DOI
10.1364/oe.17.000208
PII: 175630
Knihovny.cz E-zdroje
- MeSH
- elektrony MeSH
- laserová terapie metody MeSH
- lasery * MeSH
- mikroskopie atomárních sil MeSH
- polymethylmethakrylát MeSH
- povrchové vlastnosti MeSH
- rentgenové záření * MeSH
- sloučeniny boru účinky záření MeSH
- spektrofotometrie MeSH
- uhlík účinky záření MeSH
- ultrafialové záření MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Research Support, U.S. Gov't, Non-P.H.S. MeSH
- Názvy látek
- polymethylmethakrylát MeSH
- sloučeniny boru MeSH
- uhlík MeSH
We report the first observation of single-shot soft x-ray laser induced desorption occurring below the ablation threshold in a thin layer of poly (methyl methacrylate)--PMMA. Irradiated by the focused beam from the Free-electron LASer in Hamburg (FLASH) at 21.7 nm, the samples have been investigated by atomic-force microscope (AFM) enabling the visualization of mild surface modifications caused by the desorption. A model describing non-thermal desorption and ablation has been developed and used to analyze single-shot imprints in PMMA. An intermediate regime of materials removal has been found, confirming model predictions. We also report below-threshold multiple-shot desorption of PMMA induced by high-order harmonics (HOH) at 32 nm. Short-time exposure imprints provide sufficient information about transverse beam profile in HOH's tight focus whereas long-time exposed PMMA exhibits radiation-initiated surface ardening making the beam profile measurement infeasible.
Citace poskytuje Crossref.org
Damage Mechanisms in Polyalkenes Irradiated with Ultrashort XUV/X-Ray Laser Pulses
