br>
 <math> Hartree / (a_0^2 atomic_time) = 6.4364086e+15 W / cm^2 </math>
<br><br>
 <math> eV / ( angstrom^2 (hbar/eV) ) = 2.4341348e+12 W / cm^2 </math>
<br><br>
 If, in atomic units, we set the electric-field amplitude to <math>E_0</math>,
 then the intensity is:
<br><br>
 <math> I_0 = 3.51 10^16 W/cm^2 (E_0^2) </math>
<br><br>
 If, working with "Units = ev_angstrom", we set <math>E_0</math>, then the intensity is:
<br><br>
 <math> I_0 = 1.327 10^13 (E_0^2) W/cm^2 </math>
<br><br>

<br/><i>Options</i>:
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