Helicity-dependent dissociative tunneling ionization of CF in multicycle circularly polarized intense laser fields.

Dissociative tunneling ionization of tetrafluoromethane (CF) in circularly polarized ultrashort intense laser fields (35 fs, 0.8 × 10 W cm, 1035 nm), CF → CF + e → CF + F + e, has been studied by three-dimensional electron-ion coincidence momentum imaging. The photoelectron angular distribution in the recoil frame revealed that the dissociative tunneling ionization occurs efficiently when the laser electric field points from F to C.