  We applied angular X-ray Cross-Correlation analysis (XCCA) to scattering
images from a femtosecond resolution LCLS X-ray free-electron laser (XFEL)
pump-probe experiment with solvated PtPOP
([Pt$_2$(P$_2$O$_5$H$_2$)$_4$]$^{4-}$) metal complex molecules. The molecules
were pumped with linear polarized laser pulses creating an excited state
population with a preferred orientational (alignment) direction. Two time
scales of $1.9\pm1.5$ ps and $46\pm10$ ps were revealed by model-independent
XCCA, associated with an internal structural changes and rotational dephasing,
respectively. Our studies illustrate the potential of XCCA to reveal hidden
structural information in a model independent analysis of time evolution of
solvated metal complex molecules.
