Beam projection

Due to the small grazing-incidence angle, the beam height in GISAXS becomes projected into a long stripe along the sample. Thus GISAXS is always averaging over a large sample surface area. This implies that one must be careful that the sample is relatively homogeneous over the illuminated area.

Examples

beam height	incident angle	projection	notes
(μm)	(°)	(mm)
50	0.05	57	[1]
50	0.10	29	[2]
50	0.12	24	[3]
50	0.15	19	[4]
50	0.20	14	[5]
50	0.40	7	[6]