grb absorption spectroscopy - Inaf
grb absorption spectroscopy - Inaf
grb absorption spectroscopy - Inaf
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Balance equation:<br />
dN t<br />
u<br />
dt<br />
( )<br />
TIME DEPENDENT MODELING<br />
= N ( ) ( ) ( ) ( )<br />
l t Blu F! t $ Nu t "<br />
% Aul + BulF t #<br />
! &<br />
% ! % " % 2<br />
& t ' & $ ' & d '<br />
( ) ( ) ( )<br />
* tc + * $ c + * dL<br />
+<br />
were: F ( t) = C [ 1+<br />
z]<br />
hν<br />
Absorption<br />
#<br />
up<br />
low<br />
hν<br />
Spontaneous emission<br />
% 1<br />
up up<br />
hν<br />
low low<br />
Stimulated emission
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