SEM Review

The name for the equation that relates resolution to wavelength

TEM

Can a TEM produce a 3D image?

What is one main advantage of an SEM over a TEM?

Give 3 reasons to keep the column/sample chamber under vacuum

What can happen to cells in a vacuum?

Name 2 alternatives for solving the problem of cells rupturing in a vacuum

What type of metal is the filament made from?

Why should you set the filament temperature to the point of most effective saturation?

The average distance an electron can travel before hitting something

Name the 2 types of lenses in the SEM

Which lense focuses electrons on the sample?

Which lense controls the intensity (number of electrons) in the beam?

A ___ aperature size gives better resolution and depth of field

A __ scan spped gives better quality of image

The mean free path must be ___ than the optical column

Name the two types of pumps that make up the vacuum system. Which is more expensive?

The term for the rotating stage

Name the 3 types of electron/sample interactions we focus on

Which type of interactions allow us to get topographic (surface) information?

Which type of electron/sample interaction has elastic collisions?

Which type ofelectron/sample interaction has inelastic collisions

Which type of electron/sample interaction allows us to get elemental composition information

SE

BSE

Amalgam

Which detectors are retractable?

Which detector gives clearer 2D images? (BSE or SE)

Which detector gives good 3D images?

EDS

Does EDS rely of X-ray fluorescene or X-ray diffraction?

Increased accelerative voltage generally gives ____ resolution

Atomic number contrast is associated with which detector?

In atomic number contrast, areas with high average atomic number appear ___ while areas with low average atomic number appear ___

Where are the scanning coils located?

X ray microanalysis is another name for