title: X-ray and extreme ultraviolet emission induced by variable pulse-width irradiation of Ar and Kr clusters and droplets
abstract: Measurements are presented of x-ray (>1.5 keV) and extreme ultraviolet (EUV, lambda=2-44 nm) emission from argon and krypton supersonic gas jets at room (T=300 K) and cryogenic (T=173 K) temperatures irradiated with constant energy (50 mJ), variable width laser pulses ranging from 100 fs to 10 ns. Two regimes of jet operation are explored: cluster formation (radius<100 nm) and droplet formation (radius>1 &mgr;m). The results for both clusters and droplets can be understood in terms of two time scales: a short time scale for optimal resonant absorption at the critical density layer in the expanding plasma, and a longer time scale for the plasma to drop below critical density.
authors: Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA.
authors: E
authors: Parra
authors: I
authors: Alexeev
authors: J
authors: Fan
authors: KY
authors: Kim
authors: SJ
authors: McNaught
authors: HM
authors: Milchberg