# V(volt)/A(angstrom) to W(watt)/cm2 (centimeter square)?

1. Sep 1, 2015

### masyousaf1

Dear all

I am reading one paper and confused how authors converted V(volt)/A(angstrom) to W(watt)/cm2 (sentimeter square). The article entitled

''Modifying the Interlayer Interaction in Layered Materials with an Intense IR Laser''
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.116102
Specific Text of this paper is also attached as a screen shot.

Many thanks
Best wishes
Masood

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2. Sep 1, 2015

### Staff: Mentor

The intensity will be the average of the square of the field, with proper physical constants. Try
$$I = \frac{1}{2} \epsilon_0 c E^2$$