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We solve the three-dimensional time-dependent Schr\"{o}dinger equation for afew-cycle circularly polarized femtosecond laser pulse interacting with anoriented target exemplified by an Argon atom, initially in a $3\text{p}_{x}$ or$3\text{p}_{y}$ state. The photoelectron momentum distributions show distinctsignatures of the orbital structure of the initial state as well as thecarrier-envelope phase of the applied pulse. Our \textit{ab initio} results arecompared with results obtained using the length-gauge strong-fieldapproximation, which allows for a clear interpretation of the results in termsof classical physics. Furthermore, we show that ionization by a circularlypolarized pulse completely maps out the angular nodal structure of the initialstate, thus providing a potential tool for studying orbital symmetry inindividual systems or during chemical reactions.

Ionization of oriented targets by intense circularly polarized laser pulses: Imprints of orbital angular nodes in the 2D momentum distribution