With the conic electrode trap,the lifetime of C^(r+)_(60)was measured in 56 keV Ar^(8+)-C60 collisions.The outgoing projectiles Ar^((8-s)+),on which s captured electrons are stabilized,are selected by an electrostatic...With the conic electrode trap,the lifetime of C^(r+)_(60)was measured in 56 keV Ar^(8+)-C60 collisions.The outgoing projectiles Ar^((8-s)+),on which s captured electrons are stabilized,are selected by an electrostatic analyzer.The ejected electrons and the recoil ions were extracted from the interaction region by a high transverse electric field E=1 kV/cm.After extraction the electrons were accelerated towards a semiconductor detector(PIPS)biased at 20 kV,which gives the information on the number of emitted electrons in the react.展开更多
Supereontinuum （SC） generation from laser filamentation in air is found to depend strongly on the pulse duration. Rainbow-like SC generation is observed only for a pulse of appropriate negative chirp that agrees wit...Supereontinuum （SC） generation from laser filamentation in air is found to depend strongly on the pulse duration. Rainbow-like SC generation is observed only for a pulse of appropriate negative chirp that agrees with the predictions put forward by Golubtsov et al. [Quantum Electron. 33 （2003） 525]. The conversion efficiency of an 800-nm laser light to rainbow-like SC is found to be the highest for 257fs pulses with an initial negative chirp. A larger chirp will lead to filamentation surviving at longer distance.展开更多
In highly charged ions-C_(60)collisions,the fragmentation processes have been studied up to C^(9+)_(60).For low charge state of C^(q+)_(60)(g=1-4)the C_(2) evaporation processes have been observed.The fission processe...In highly charged ions-C_(60)collisions,the fragmentation processes have been studied up to C^(9+)_(60).For low charge state of C^(q+)_(60)(g=1-4)the C_(2) evaporation processes have been observed.The fission processes consisting of the emission of light charged fragments have been observed typically for charge state ranging from q=3 to q=9.The multi-fragmentation processes appear from 5=4 and became quickly dominant for higher charge states.展开更多
文摘With the conic electrode trap,the lifetime of C^(r+)_(60)was measured in 56 keV Ar^(8+)-C60 collisions.The outgoing projectiles Ar^((8-s)+),on which s captured electrons are stabilized,are selected by an electrostatic analyzer.The ejected electrons and the recoil ions were extracted from the interaction region by a high transverse electric field E=1 kV/cm.After extraction the electrons were accelerated towards a semiconductor detector(PIPS)biased at 20 kV,which gives the information on the number of emitted electrons in the react.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10634020, 10390161, 60621063, and 10734130, the National Basic Research Programme of China Grant No 2007CB815100, and the National Hi-Tech ICF Project.
文摘Supereontinuum （SC） generation from laser filamentation in air is found to depend strongly on the pulse duration. Rainbow-like SC generation is observed only for a pulse of appropriate negative chirp that agrees with the predictions put forward by Golubtsov et al. [Quantum Electron. 33 （2003） 525]. The conversion efficiency of an 800-nm laser light to rainbow-like SC is found to be the highest for 257fs pulses with an initial negative chirp. A larger chirp will lead to filamentation surviving at longer distance.
文摘In highly charged ions-C_(60)collisions,the fragmentation processes have been studied up to C^(9+)_(60).For low charge state of C^(q+)_(60)(g=1-4)the C_(2) evaporation processes have been observed.The fission processes consisting of the emission of light charged fragments have been observed typically for charge state ranging from q=3 to q=9.The multi-fragmentation processes appear from 5=4 and became quickly dominant for higher charge states.
