The Fine Structure of X-Ray Diffuse Scattering in the Vicinity of High-Angle Superlattice Bragg Reflections
Научная публикация
| Общая информация |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Acta Crystallographica Section A: Foundations of Crystallography
ISSN: 0108-7673
, E-ISSN: 1600-5724
|
| Вых. Данные |
Год: 2003,
Том: 59,
Номер: 6,
Страницы: 551-559
Страниц
: 9
DOI:
10.1107/S0108767303020002
|
| Авторы |
Chernov V.A.
1
,
Kovalenko N.V.
2
,
Mytnichenko S.V.
3
,
Toropov S.N.
4
|
| Организации |
| 1 |
Boreskov Institute of Catalysis, Siberian SR Center at Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia
|
| 2 |
Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia
|
| 3 |
Institute of Solid State Chemistry, Siberian SR Center at Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia
|
| 4 |
Institute of Semiconductor Physics, 630090 Novosibirsk, Russia
|
|
Информация о финансировании (1)
|
1
|
Российский фонд фундаментальных исследований
|
03-02-16259
|
Triple-axis X-ray diffractometry was used to study diffuse scattering from an AlAs/GaAs superlattice grown on an [001]-oriented GaAs substrate by molecular beam epitaxy. Reciprocal-space maps were obtained around the 002 redlection from the superlattice and its low-angle first-order satellite. The data obtained reveal quasi-Bragg diffuse-scattering sheets caused by conformal behavior of interfacial roughness as well as amplification of diffuse scattering when the incoming or outgoing angle is nearly equal to the Bragg angle of the superlattice or substrate. The observed features of diffuse-scattering fine structure are explained within the framework of the distorted-wave Born approximation. Nevertheless, this approximation is shown to be incorrect for quantitative analysis of diffuse scattering. In particular, the observed domination in intensity of the incoming Bragg features over the outgoing ones is shown to re¯ect the decay rate of the coherent X-ray field through the diffusescattering channel, which is not negligible relative to the coherent diffraction.