Electromagnetic-wave-pumped free-electron laser in a plasma channel

Abstract

An intense short laser pulse or a millimetre wave propagating through a plasma channel may act as a wiggler for the generation of shorter wavelengths. When a relativistic electron beam is launched into the channel from the opposite direction, the laser radiation is Compton/Raman backscattered to produce coherent radiation at shorter wavelengths. The scheme, however, requires a superior beam quality with energy spread less than 1% in the Raman regime.

Comparison of biological activities of selenium and silver nanoparticles attached with bioactive phytoconstituents: green synthesized using Spermacoce hispida extract

“…The effect of these param eters on the synthesis of Sh-AgNPs and Sh-SeNPs was monitored using UV-vis spectrophotometer (Shimadzu UV 1800 UV/Vis spectro meter) by scanning between 300 and 600 nm. At the end of the incubation period, the NPs produced were harvested by centrifugation at 5000 rpm for 30 min [10]. The Sh-AgNPs and Sh-SeNPs obtained were washed with distilled water for three times to remove excess silver or selenium ions and other fine particles.…”

Green synthesis and characterization of palladium nanoparticles and its conjugates from solanum trilobatum leaf extract

“…Recently, the advances in fabrication of palladium nanoparticles (PdNPs) have gained great importance owing to their application both in heterogeneous and homogeneous catalysis, their high surfaceto-volume ratio and their high surface energy [4]. http://www.nmletters.org methods [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The rate of reduction of metal ions in the method of using plants has been found to be much faster than the method of using micro-organisms and stable.…”

One-pot synthesis of PVA-capped silver nanoparticles their characterization and biomedical application

“…The selected area electron diffraction (SAED) micrograph of SNPs ( figure 6(d)). shows FCC crystalline structure with indexed diffracting planes [29].…”