I am wondering if it is possible to parametrize the space of all unitary 3 by 3 matrices with complex entries.

with U being any unitary 3 by 3 matrix.

We know that the column vectors have to be orthonormal such that we have the unitary property .

So let then we can write

this is just a sphere in and we can easily parametrize it as follows

using these we can find the corresponding parametrization of the first column. My question is how would we parametrize the remainder of the matrix?

If and are respectively the second and third columns of U, then we know that

if and 1 otherwise

we would have to consider the space orthogonal to , this space must be some two dimensional plane. The vectors must then lien in this plane.

I can solve this problem for the case of two by two matrices with complex entries and wanted to see if it was at all possible for higher dimensions, however the parametrization is a little tricky.