Damage mechanisms in polyalkenes irradiated with ultrashort XUV/X-ray laser pulses

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00598519" target="_blank" >RIV/68378271:_____/24:00598519 - isvavai.cz</a>
Alternative codes found
RIV/61389021:_____/24:00617256 RIV/68407700:21340/24:00382756
Result on the web
<a href="https://hdl.handle.net/11104/0356177" target="_blank" >https://hdl.handle.net/11104/0356177</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.jpcb.4c04126" target="_blank" >10.1021/acs.jpcb.4c04126</a>

Result language
angličtina
Original language name
Damage mechanisms in polyalkenes irradiated with ultrashort XUV/X-ray laser pulses
Original language description
Although polymers are widely used in laser-irradiation research, their microscopic response to high-intensity ultrafast XUV and X-ray irradiation is still largely unknown. Here, we comparatively study a homologous series of alkenes. The XTANT-3 hybrid simulation toolkit is used to determine their damage kinetics and irradiation threshold doses. The code simultaneously models the nonequilibrium electron kinetics, the energy transfer between electrons and atoms via nonadiabatic electron−ion (electron−phonon) coupling, nonthermal modification of the interatomic potential due to electronic excitation, and the ensuing atomic response and damage formation. It is shown that the lowest damage threshold is associated with local defect creation, such as dehydrogenation, various group detachments from the backbone, or polymer strand cross-linking. At higher doses, the disintegration of the molecules leads to a transient metallic liquid state: a nonequilibrium superionic state outside of the material phase diagram. We identify nonthermal effects as the leading mechanism of damage, whereas the thermal (nonadiabatic electronion coupling) channel influences the kinetics only slightly in the case of femtosecond-pulse irradiation.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Project
<a href="/en/project/LM2023068" target="_blank" >LM2023068: Prague Asterix Laser System</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)