Spatial displacement of forward-diffracted X-ray beams by perfect crystals.
Acta Crystallogr A Found Adv
; 74(Pt 2): 75-87, 2018 Mar 01.
Article
in En
| MEDLINE
| ID: mdl-29493536
ABSTRACT
Time-delayed, narrow-band echoes generated by forward Bragg diffraction of an X-ray pulse by a perfect thin crystal are exploited for self-seeding at hard X-ray free-electron lasers. Theoretical predictions indicate that the retardation is strictly correlated to a transverse displacement of the echo pulses. This article reports the first experimental observation of the displaced echoes. The displacements are in good agreement with simulations relying on the dynamical diffraction theory. The echo signals are characteristic for a given Bragg reflection, the structure factor and the probed interplane distance. The reported results pave the way to exploiting the signals as an online diagnostic tool for hard X-ray free-electron laser seeding and for dynamical diffraction investigations of strain at the femtosecond timescale.
Full text:
1
Database:
MEDLINE
Type of study:
Prognostic_studies
Language:
En
Journal:
Acta Crystallogr A Found Adv
Year:
2018
Type:
Article
Affiliation country:
Switzerland