Keldysh Parameter calculator

Intenisty,   I  = PW/cm2
Wavelength, nm
Ip (ionization potential) eV, 13.6 (H), 20.18 (Ne), 15.76 (Ar),14.00 (Kr), 12.13 (Xe) Periodic table by NIST

Ponderomotive energy, Up = 9.337 38 x 10-5 I [PW/cm2] 2
[nm] = eV
Keldysh parameter, = sqrt (Ip/2Up) =
Over barrier field, Fc(au)= Ip(au)2/2/[2-sqrt(2Ip(au))] =
Corresponding Intensity, Ic (TW/cm2)=