Interlayer Pd for the Li/Pd/Cu neutron target for BNCT （boron neutron capture therapy） was characterized after 0.1-5 keV H2^＋ irradiation by XAFS （X-ray absorption fine structure） technique, and following conclus...Interlayer Pd for the Li/Pd/Cu neutron target for BNCT （boron neutron capture therapy） was characterized after 0.1-5 keV H2^＋ irradiation by XAFS （X-ray absorption fine structure） technique, and following conclusions were derived： （1） from the XAFS observation of white line of Pd, remarkable Pd L3 edge jump was found in 1.1-3 times higher than before irradiation in low irradiation fluence; （2） this fact indicates increase of hole density in Pd 4d-band, whereas, no change was observed for XASF spectra of Ag sample under the same irradiation conditions; （3） remarkable Pd L3 edge shift of 0.12-0.66 eV was also found with increase of H2＋ irradiation energy in low fluence, and drastically decreased after peak in high irradiation energy and fluence; （4） implanted protons deposited in Pd as negative under the balance of electron population enhanced by proton irradiation and charge transfer.展开更多
理论研究了双色线偏振激光场驱动H_2^+分子产生椭圆偏振谐波及阿秒脉冲的特点.计算结果表明:随着不同偏振角的引入,谐波光谱呈现不规则的椭圆率.但是,随着空间非均匀效应的引入,不仅谐波谱的椭圆率可以稳定在ε=0.1和ε=0.3之间,而且谐...理论研究了双色线偏振激光场驱动H_2^+分子产生椭圆偏振谐波及阿秒脉冲的特点.计算结果表明:随着不同偏振角的引入,谐波光谱呈现不规则的椭圆率.但是,随着空间非均匀效应的引入,不仅谐波谱的椭圆率可以稳定在ε=0.1和ε=0.3之间,而且谐波发射的截止能量明显增强.形成4个具有较小干涉结构带宽在406 e V,299 e V,381 e V和582 e V的超长平台区.最后,通过傅里叶变换,可获得5个脉宽及椭圆率为24 as(ε=0.1),22 as(ε=0.3),24 as(ε=0.3),19 as(ε=0.3),19 as(ε=0.3)的阿秒X射线脉冲.展开更多
文摘Interlayer Pd for the Li/Pd/Cu neutron target for BNCT （boron neutron capture therapy） was characterized after 0.1-5 keV H2^＋ irradiation by XAFS （X-ray absorption fine structure） technique, and following conclusions were derived： （1） from the XAFS observation of white line of Pd, remarkable Pd L3 edge jump was found in 1.1-3 times higher than before irradiation in low irradiation fluence; （2） this fact indicates increase of hole density in Pd 4d-band, whereas, no change was observed for XASF spectra of Ag sample under the same irradiation conditions; （3） remarkable Pd L3 edge shift of 0.12-0.66 eV was also found with increase of H2＋ irradiation energy in low fluence, and drastically decreased after peak in high irradiation energy and fluence; （4） implanted protons deposited in Pd as negative under the balance of electron population enhanced by proton irradiation and charge transfer.
文摘理论研究了双色线偏振激光场驱动H_2^+分子产生椭圆偏振谐波及阿秒脉冲的特点.计算结果表明:随着不同偏振角的引入,谐波光谱呈现不规则的椭圆率.但是,随着空间非均匀效应的引入,不仅谐波谱的椭圆率可以稳定在ε=0.1和ε=0.3之间,而且谐波发射的截止能量明显增强.形成4个具有较小干涉结构带宽在406 e V,299 e V,381 e V和582 e V的超长平台区.最后,通过傅里叶变换,可获得5个脉宽及椭圆率为24 as(ε=0.1),22 as(ε=0.3),24 as(ε=0.3),19 as(ε=0.3),19 as(ε=0.3)的阿秒X射线脉冲.
