Strong-field ionization of aligned diatomic and polyatomic molecules such as ${\mathrm{O}}_2$, ${\mathrm{N}}_2$, ${\mathrm{C}}_2{\mathrm{H}}_4$, and others in circularly polarized laser fields is investigated theoretically. By calculating the emission-angle-resolved lateral width of the momentum distribution perpendicular to the polarization plane, we show that nodal planes in molecular orbitals are directly imprinted on the angular dependence of the width. We demonstrate that orbital symmetries can be distinguished with the information obtained by observing the lateral width in addition to the angular distributions.

• Received 3 December 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.103004