Site-Specific Excitation in Free Krypton Clusters

On the recollision-free excitation of krypton during ultrafast multi-electron tunnel ionization

The probability of multiple ionization of krypton by 50 femtosecond circularly polarized laser pulses, independent of the optical focal geometry, has been obtained for the first time. The excellent agreement over the intensity range 10 TWcm to 10 PWcm with the recent predictions of A. S. Kornev et al [Phys. Rev. A 68, 043414 (2003)] provides the first experimental confirmation that non-recollis...

Utilization of Site-Specific Recombination in Biopharmaceutical Production

Mammalian expression systems, due to their capacity in post-translational modification, are preferred systems for biopharmaceutical protein production. Several recombinant protein systems have been introduced to the market, most of which are under clinical development. In spite of significant improvements such as cell line engineering, introducing novel expression methods, gene silencing and pr...

Electron impact fragmentation of size-selected krypton clusters.

Clusters of krypton are generated in a supersonic expansion and size selected by deflection from a helium target beam. By measuring angular distributions for different fragment masses and time-of-flight distributions for fixed deflection angles and fragment masses, the complete fragmentation patterns for electron impact ionization at 70 eV are obtained from the dimer to the heptamer. For each o...

Fluorescence excitation spectroscopy of Xenon doped Neon clusters: size and site effects, and cluster melting

Electronic excitations of Xe atoms and Xe2 molecules embedded in free Ne clusters are studied with time resolved fluorescence excitation spectroscopy. Several distinct absorption bands blueshifted relativ to the first atomic resonance line of Xe are observed and are attributed to Xe or Xe2 located in different sites. For Ne clusters containing less than 300 atoms only interior sites are observe...

High Frequencygroundmotion in Centralméxico: Site, Excitation Andattenuation