In this theoretical study we explore the feasibility to obtain molecular properties of the Criegee intermediate formaldehyde oxide (CH2OO) with hexapole state selection. Ab-initio calculations yielding the rotational constants and dipole moments of formaldehyde oxide are used as input for the simulations. Subsequently the hexapole focusing spectra are simulated for the low field seeking states. The focusing curves are sensitive to the details of the dipole moment, suggesting that the hexapole can be a useful tool to study the molecular properties of formaldehyde oxide, or potentially to select CH2OO for molecular beam scattering or photodissociation measurements. (C) 2014 Elsevier B.V. All rights reserved.