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LAB SESSION (SCHEME OF SPECTROMETRY (Absorption of light = measure the…
LAB SESSION
SCHEME OF SPECTROMETRY
Absorption of light
= measure the loss of intensity
SCHEME
radiation
source
:!:
monochromatic light
emitted radiation with intensity Io
sample
unabsorbed radiation with intensity I and I < Io.
radiation detector
a hollow cathode lamp produces monochromatic light
a lamp = white light + dispersion system
Emission of light
= measure the intensity of the emitted light
SCHEME
energy source
:!:
excitation of the sample
sample
emitted radiation
dispersion system
:!:
monochromatic light
radiation detector
convert emitted radiation into monochromatic light
a filter
a monochromator (grating or prism)
enery forms are
warmth (= a flame)
electric discharge
AAS (atomic absorption spectroscopy)
Atom and its structure
http://www.chem4kids.com/files/atom_structure.html
what is AAS
https://web.nmsu.edu/~esevosti/report.htm
SPECTROSCOPY
http://www.rsc.org/learn-chemistry/collections/spectroscopy/introduction#IRSpectroscopy