Topics+for+Discussion

What are the problems? What can we achieve?

Coherence: - challenges for single-molecule single-shot imaging - can we extrapolate from studies for small systems (atoms, small molecules) to large systems - development of quantum-mechanical approaches to treat large systems (i.e., beyond classical molecular dynamics) - noise in scattering patterns due to ionization - inversion problem in the presence of noise - coherent scattering from dynamically evolving targets - impact of pulse envelope effects - need for improved modeling of single-shot scattering patterns - nonclassical correlations in x-ray photon correlation spectroscopy - quantum effects in single-shot imaging - ankylography (inversion problem)

High (x-ray) intensity: - perturbative vs. nonperturbative processes - many-body effects in dense, excited systems - opportunities enabled by high intensity (for instance, x-ray nonlinear optics) - identification of mechanisms underlying ionization and nonlinear processes - differences between optical and x-ray regimes - role of hollow-atom formation in coherent diffractive imaging - x-ray propagation effects in condensed matter (matter under extreme conditions) - possibilities for pulse compression and spectral broadening - role of shake-off and double Auger at high intensity

Ultrafast: - delay in photoemission: what is the role of electron correlation effects? - dynamics of one-photo double ionization - imaging in strong field via electron recollision (inversion problem) - preparation of hole wave packets: role of coherences - opportunities for probing ultrafast nonadiabatic nuclear dynamics - conical intersections and coherent diffractive imaging - computational challenge: high harmonic generation using a long-wavelength driving field - theoretical/computational tools for time-resolved XANES/EXAFS/RIXS ... - beyond photochemistry: time domain studies of nontrivial chemical reactions - dynamics in correlated electron systems - many-electron problem in strong-field physics