CCMR - RET 2008 WEEK 5. A type of electron microscope that images the sample surface by scanning it with a high-energy beam of electrons in a raster scan pattern. . SEM (scanning electron microscope). How does SEM work?.
1149 Snee Hall
- This knocks out inner electrons in the sample
- The atom is now in an excited state. An outer electron drops down to the inner energy level releasing energy in the form of x-rays at the same time.
A.Electrons are generated by heating a tungsten filament similar to the one in a light bulb.
B.Electrons pass through lenses that condense the beam, remove aberrations and focus the beam
E.The reflected rays are then counted and recorded by a detector.
D.X-rays are then reflected through a crystal
Since the fingernail is an organic compound, there was a
large carbon peak. Other elements such as calcium and sulfur
might be found in fingernails normally.
Chemical analysis of rocks, dating, plate tectonics
Compositional distinctions between 16th century ‘fac¸on-de-Venise’ and
Venetian glass vessels excavated in Antwerp, Belgium†
I. De Raedt,aK. Janssens*a and J. Veeckmanb
aDepartment of Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium.
E-mail: [email protected]
bExcavation Department of the City of Antwerp, Godefriduskaai 36, B-2000 Antwerp, Belgium
Received 29th October 1998, Accepted 10th December 1998
JEOL 6300 SEM/EDX
Based on chemical analysis,
50% of the glassware was from Italy
The SEM solution for Automated
Analysis and Classification of
SEM/ Microprobe is used to analyze
inorganic compounds in gunshot residue
FOR FUEL CELLS
(Based on lecture by Hector Abruna)
Sputter different concentrations
of metals onto a substrate
higher electrochemical activity
3. Use scanning electrochemical microscopy (SECM)
to test sample’s ability to oxidize hydrogen/formic acid
and reduce oxygen.
Of the product before bulk manufacture
Obtain composition with microprobe
and Rutherford backscattering (RBS)
SEM-Observe texture and crystal grain size
GADDS-Determine crystal structure
Large peak seen for Niobium.
About 10% of mass unaccounted for.
the missing mass- the niobium was probably oxidized.
Butterfly Scales showing overlapping pattern
Individual scales showing ribbing pattern
Tips of Fringe scales
Optical Microscope -Transmitted Light
Optical Microscope – Reflected Light
Wing Scale Unpolarized Light 50x objective lens
Wing Scale Polarized Light 50x objective lens