Ultrafast anisotropic disordering in graphite driven by intense hard X-ray pulses

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F19%3A00580118" target="_blank" >RIV/61389021:_____/19:00580118 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/18:00511156

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1574181819300321?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1574181819300321?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.hedp.2019.05.002" target="_blank" >10.1016/j.hedp.2019.05.002</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Ultrafast anisotropic disordering in graphite driven by intense hard X-ray pulses

Popis výsledku v původním jazyce

We present results from the SPring-8 Angstrom Compact free electron LAser (SACLA)X-ray free electron laser (XFEL)facility, using an X-ray pump, X-ray probe scheme to observe ultrafast changes in the structure of heated graphite. The 9.8 keV XFEL beam was focused to give an intensity on the order of ∼ 1019 W/cm2, and the evolution of the diffraction pattern observed up to delays of 300 fs. The interplanar diffraction peaks weaken significantly within 10s of femtoseconds, but in-plane diffraction orders i.e. those with Miller Index (hk0), persist up to 300 fs, with the observed signal increasing. We interpret this as nonthermal damage through the breaking of interplanar bonds, which at longer timescales leads to ablation by removal of intact graphite sheets. Post-experiment examination of the graphite samples shows damage which is comparable in size to the range of the excited photoelectrons. These results highlight the challenges of accurately modelling X-ray driven heating, as it becomes a routine approach to generating high energy density states.

Název v anglickém jazyce

Ultrafast anisotropic disordering in graphite driven by intense hard X-ray pulses

Popis výsledku anglicky

We present results from the SPring-8 Angstrom Compact free electron LAser (SACLA)X-ray free electron laser (XFEL)facility, using an X-ray pump, X-ray probe scheme to observe ultrafast changes in the structure of heated graphite. The 9.8 keV XFEL beam was focused to give an intensity on the order of ∼ 1019 W/cm2, and the evolution of the diffraction pattern observed up to delays of 300 fs. The interplanar diffraction peaks weaken significantly within 10s of femtoseconds, but in-plane diffraction orders i.e. those with Miller Index (hk0), persist up to 300 fs, with the observed signal increasing. We interpret this as nonthermal damage through the breaking of interplanar bonds, which at longer timescales leads to ablation by removal of intact graphite sheets. Post-experiment examination of the graphite samples shows damage which is comparable in size to the range of the excited photoelectrons. These results highlight the challenges of accurately modelling X-ray driven heating, as it becomes a routine approach to generating high energy density states.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

High energy density physics

ISSN

1574-1818

e-ISSN

1878-0563

Svazek periodika

32

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

63-69

Kód UT WoS článku

000484661300009

EID výsledku v databázi Scopus

2-s2.0-85066290622