lecture 11 atomic absorption. only photons of one specified wavelength are absorbed ground state...
Post on 21-Dec-2015
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Width
Dopplerc
v
Speed of light 300,000,000 m/s
Velocity of a particle >1000 m/s
collisions Approximately as Doppler
Both effects increase with the temperature and
decrease with the size of the molecule/atom
Multiple energy levels
Width is around 0.01-0.001 nm in visible area
E(eV)
E=h/c
kT
E
eN
N
~0
N0
N* Flame Temperature
Butane-air <2200Acetylene-air 2400-2600
Acetylene-N2O 2900-3100
Acetylene-O2 3300-3400