Can anyone kindly suggest a software which helps us to find space group of a molecule. I am working with gaussian and we want to start writing input of a molecule by considering its symmetry alone and also to find IR and Raman modes of a molecule.
I think you can check this link may help you to find out : if you want to write the geometry of your molecule you can used chemdraw or chem3D programs . good luck
i also recommend GaussView as oleg said . if u r not having it , then send me the molecule structure/ iupac name and i will reply u back with the point group of ur molecule.
Addition to the above answers you can also go for Avogadro(https://sourceforge.net/projects/avogadro/files/latest/download)& use this link (https://avogadro.cc/docs/building-materials/crystal-symmetry-perception/), this shows how to get information about spacegroup.