###
**class announcement**

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A good introductory web article on atomic spectroscopy is now available:

Atomic
Spectroscopy

by W. C. Martin and W. L. Wiese
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**Problem set 10 (due
5/10/99)**

1. Consider single ionization in an ion-atom collision event. The electron
initially has a binding energy of E_{i} (a negative number) and
after ionization it has energy E_{f} (a positive number). Use conservation
of energy and conservation of momentum in the parallel and perpendicular
directions (with respect to the beam direction), show that the momentum
of the recoil ion in the parallel direction is given by
P_{R||}= ( E_{f} -E_{i})/v -k_{e||}

where R stands for recoil ion and e for the electron. In deriving the
equation above, use want to use the fact that the mass of the nucleus is
much higher than the mass of the electron.

**Table 1:
3l3l' doubly excited states of H-**
**Table2:
3l3l' states of C4+**

**Additional
Notes :Recent papers related to the subjects covered
this semester**

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**Earlier assignments**

**problem
set 9**
**problem
set 8**
**problem
set 7**
**problem
set 6**
**problem
set 5**
**problem
set 4**
**problem
set 3**
**problem
set 2**
**problem
set 1**