|
We study the interaction of short and intense X-ray pulses with clusters of protonated molecules such
as CH4 and H2O, [1]. We find that due to the effective positive charge outflow (i.e. faster expansion
of the proton component see e.g. [2] and references therein) that lowers the cluster potential formed by
the massive ionization, the temperature of the electron plasma generated inside the cluster is sensibly
lower than in the case of a pure atomic cluster where no positive charge loss is possible. We argue that
the relatively low electron temperature is responsible for the effcient recombination of the electrons on
molecular fragments recently observed in experiments at LCLS [3]. References [1] Di Cintio P.F., Gnodtke C., Saalmann U. and Rost J.M. \Dynamics of methane clusters under short XFEL pulses", 2012, in preparation. [2] Popov K.I., Bychenkov V. Y., Rozmus W., Kovalev V.F. and Sydora R.D., \Mono-energetic ions from collisionless expansion of spherical multi-species clusters", 2009, Laser and Particle Beams 27, 321. [3] Kandadai, N. et al., 2012, in preparation. |
|