grb absorption spectroscopy - Inaf
grb absorption spectroscopy - Inaf
grb absorption spectroscopy - Inaf
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FINE STRUCTURE FEATURES<br />
How to populate fine structure excited levels:<br />
1. Collisional processes:<br />
2. Radiative processes:<br />
Incident UV<br />
radiation<br />
Incoming<br />
e -<br />
2a. Indirect UV pumping<br />
Photoexcitation<br />
n + 1<br />
Radiative<br />
de-excitation<br />
n<br />
J=3/2<br />
J=1/2<br />
Incident IR<br />
radiation<br />
(Si II, C II) (Fe II)<br />
n<br />
(O I)<br />
2b. Direct IR pumping<br />
STRONG VARIABILITY EXPECTED!<br />
J=2<br />
J=1<br />
J=0<br />
Selection<br />
rule: ΔJ=0,±1<br />
n<br />
J=1/2<br />
J=3/2<br />
J=5/2<br />
J=7/2<br />
J=9/2
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