Polarization dependence of carbon fragments from methane in strong and ultrastrong laser fields

We present the polarization dependence of the ultrafast photoionization for C
⁺ⁿ
(n ≤ 5) fragments from methane. The study extends from the strong field (C
⁺
, C
⁺²
) at 10
¹⁴
W/cm
²
to the ultrastrong field (C
⁺⁵
) at 10
¹⁸
W/cm
²
.