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Physics 780.04
Winter Quarter 2007
Dr. Herbst
14 February
MIDTERM EXAMINATION (100 POINTS)
IN CLASS
1.
(20 points) Consider a spectral transition between two nondegenerate states
separated by 1000 cm
1
.
The Einstein A coefficient for the transition is 1 s
1
. In
absorption, the spectral line is broadened by pressure broadening with a FWHM
Δν
of 100 MHz. Determine the absorption coefficient (cm
1
) at resonance and
calculate the fraction of incident radiation that traverses 1cm and 1m cells at this
wave number. The concentration of molecules in the lower state is 10
15
cm
3
.
2.
(15 points) The electron affinity of atomic hydrogen is 0.76 eV. This statement
means that the negative ion H

has its ground state 0.76 eV below that of H(1s) +
e. Find the shielding that each electron must exert upon the other in H

so that the
simple independent electron model reproduces the experimental electron affinity.
3.
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This note was uploaded on 06/13/2011 for the course PHYSICS 780.04 taught by Professor Staff during the Winter '07 term at Ohio State.
 Winter '07
 Staff
 Physics

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