Fragmentation Dynamics of Endohedral Fullerene Ho$_{3}$N@C$_{80}$ Ionized with Intense and Short X-Ray FEL Pulses*

The photoionization and fragmentation dynamics of gas phase endohedral fullerenes Ho$_{3}$N@C$_{80}$ with intense femtosecond X-ray pulses from the Linac Coherent Light Source (LCLS) free electron laser (FEL) have been investigated. The central photon energy of the x-ray pulses was set at 1530 eV, targeting the absorption of the 3d electron on Ho. Multiphoton ionization led to the highest charge state observed on the parent molecule to be Ho$_{3}$N@C$_{80}^{5+}$, suggesting a stable structure even with 5 charges on the parent molecule. We will present the different atomic and molecular fragments dynamics observed.