The H+H2 reaction is the simplest chemical reaction system and has long been the prototype model in the study of reaction dynamics. Here we report a high resolution experimental investigation of the state-to-state rea...The H+H2 reaction is the simplest chemical reaction system and has long been the prototype model in the study of reaction dynamics. Here we report a high resolution experimental investigation of the state-to-state reaction dynamics in the H+HD→H2+D reaction by using the crossed molecular beams method and velocity map ion imaging technique at the collision energy of 1.17 eV. D atom products in this reaction were probed by the near threshold 1+1'(vacuum ultraviolet+ultraviolet) laser ionization scheme. The ion image with both high angular and energy resolution were acquired. State-to-state differential cross sections was accurately derived. Fast forward scattering oscillations, relating with interference effects in the scattering process, were clearly observed for H2 products at H2(v'=0,j'=1) and H2(v'=0,j'=3) rovibrational levels. This study further demonstrates the importance of measuring high-resolution differential cross sections in the study of state-to-state reaction dynamics in the gas phase.展开更多
针对基于多散射中心模型回波的一维距离像(High Resolution Range Profile,HRRP)难以真实反映复杂目标散射特性的问题,研究了基于电磁散射模型回波的生成方法和HRRP宽带特征提取方法。首先应用等效电磁流法(Method of Equivalent Curren...针对基于多散射中心模型回波的一维距离像(High Resolution Range Profile,HRRP)难以真实反映复杂目标散射特性的问题,研究了基于电磁散射模型回波的生成方法和HRRP宽带特征提取方法。首先应用等效电磁流法(Method of Equivalent Currents,MEC)棱边修正的物理光学(Physical Optics,PO)算法解算飞机目标动静态电磁散射特性;其次基于目标散射场数据,生成目标回波、仿真HRRP序列,提取目标宽带特征信息;最后求解了目标在设定航迹下的平均识别率,量化分析了信噪比对目标识别率的影响。理论分析与仿真结果表明:当信噪比(Signal-to-Noise Ratio,SNR)大于5 dB时,基于电磁散射建模的平均识别率相对基于传统的多散射中心模型提升了20%。展开更多
基金supported by the National Key R&D Program of China (No.2016YFF0200500)the National Natural Science Foundation of China (No.21473173, No.21590802, No.21403207, No.21503206)the Strategic Priority Research Program of Chinese Academy of Sciences (No.XDB17000000)
文摘The H+H2 reaction is the simplest chemical reaction system and has long been the prototype model in the study of reaction dynamics. Here we report a high resolution experimental investigation of the state-to-state reaction dynamics in the H+HD→H2+D reaction by using the crossed molecular beams method and velocity map ion imaging technique at the collision energy of 1.17 eV. D atom products in this reaction were probed by the near threshold 1+1'(vacuum ultraviolet+ultraviolet) laser ionization scheme. The ion image with both high angular and energy resolution were acquired. State-to-state differential cross sections was accurately derived. Fast forward scattering oscillations, relating with interference effects in the scattering process, were clearly observed for H2 products at H2(v'=0,j'=1) and H2(v'=0,j'=3) rovibrational levels. This study further demonstrates the importance of measuring high-resolution differential cross sections in the study of state-to-state reaction dynamics in the gas phase.
文摘针对基于多散射中心模型回波的一维距离像(High Resolution Range Profile,HRRP)难以真实反映复杂目标散射特性的问题,研究了基于电磁散射模型回波的生成方法和HRRP宽带特征提取方法。首先应用等效电磁流法(Method of Equivalent Currents,MEC)棱边修正的物理光学(Physical Optics,PO)算法解算飞机目标动静态电磁散射特性;其次基于目标散射场数据,生成目标回波、仿真HRRP序列,提取目标宽带特征信息;最后求解了目标在设定航迹下的平均识别率,量化分析了信噪比对目标识别率的影响。理论分析与仿真结果表明:当信噪比(Signal-to-Noise Ratio,SNR)大于5 dB时,基于电磁散射建模的平均识别率相对基于传统的多散射中心模型提升了20%。
