EPJ manuscript No. (will be inserted by the editor) Ionization of Rydberg Atoms in THz-Lase

1E+21E+31E+4

0.0

0.40.8calc.exp.I o n i z a t i o n P r o b a b i l i t y (V/cm)

E n =19.48

*n=19a)b)Laser

1E+2

1E+31E+410%10%50%a)

exp.

b)calc.

50%

(V /c m )t h r e s h E 2010304050

n

*

1E-11E+01E+11E+2

-5

-3-1

-4-20

s i n s c a l i n g n *s

Scaled Frequency ?