Radiation damage of C1H1, N1H1 and O1H1 clusters induced by irradiation with x-ray free electron lasers

We developed a simulation code for the radiation damage of clusters (pseudo-biomolecules) induced by irradiation with x-ray free electron lasers (XFEL). We evaluated the radiation damage of C1H1, N1H1 and O1H1 clusters induced by XFEL irradiation by using the code developed and considering the photoionization, Compton scattering, Auger decay, electron-impact ionization and electric field ionization. We found that the clusters were ionized by the XFEL irradiation at an x-ray flux of about 1x1019 photons mm-2 at a target radius of 100 A, and the radiation damage of the clusters increased slightly as the atomic number of the atoms in the targets increased. We found that the radiation damage of the clusters is almost independent of the pulse widths in the case of the same x-ray flux and the same target if the pulse widths are less than 10 fs.