2 e coincidence measurement
Double ionization
T=T
delay
T=0
p
2
He
**
p
1
pump
probe
Ionization yield
1.
Gaussian
2.
1st order purtarbation
3.
Direct product of the
plane waves (Final state)
4.
Velocity gauge
Ionization prob
dipole
Time evolution of
the momentum
space wave function
“Masking” function
→1
(for T
→
0)