Scattering from large and layered structures

What is the small angle approximation?

• qa > 2π

• qa < 2π

• qa = 2π

• qa ≠ 2π

What is the main application of neutron reflectometry?

• Studying large structures such as molecules

• Investigating the structure of biological complexes

• Exploring the formation of skyrmions

• Studying layered structures

The purpose of the velocity selector in a SANS instrument layout is to (a)   the neutron beam

• monochromate
• collimate
• detect
• scatter

When neutrons pass through a material without interacting with it we call it ​ (a)  

• transmission
• reflection
• absorption
• scattering

Place the labels correctly on the SANS instrument

d

e

c

b

a

Collimators

Detector

Sample

Evacuated tube

Velocity selector

Match the following expressions

• Form factor for SANS

• Scattering length density contrast

• Scattering length density

• Structure factor for nano particles

• Snell's law