Usually the research and application for selective excitation do not deal with the excitation state which varies with time and can be controlled by external voltage with time. This paper analyzes the se-lective excita...Usually the research and application for selective excitation do not deal with the excitation state which varies with time and can be controlled by external voltage with time. This paper analyzes the se-lective excitation rate by electron impact on the basis of atomic collision physics. The external pulse control method was used to control the electron energy in ionized gases successfully. It has been obtained that the se-lective excitation can be varied with time by controlling the electron energy. The effect of selective excitation was detected by measuring relative spectral intensity distribution. The results of this paper have established the necessary fundamentals for realization and application of variable color luminescence in ionized gases.展开更多
利用激发塑型(exc itation scu lpting)方法,结合多频率选择性激发的形状脉冲(shaped pu lse)、13C CPD去偶和修整脉冲(trim pu lse)等手段进行多个(重)强峰的压制,测试了市售白酒的各种1H核磁共振谱图,并根据样品性质对脉冲序列中的各...利用激发塑型(exc itation scu lpting)方法,结合多频率选择性激发的形状脉冲(shaped pu lse)、13C CPD去偶和修整脉冲(trim pu lse)等手段进行多个(重)强峰的压制,测试了市售白酒的各种1H核磁共振谱图,并根据样品性质对脉冲序列中的各种参数进行了优化。在压制了其中水和乙醇峰后得到的一维、二维谱图中,清晰地呈现了各个微量组分的谱峰以及反映各组分化学结构的相关峰,据此对图谱中各个谱峰进行了指认。实验表明这种方法对酒类产品的分析研究非常有效,可以应用于酒类生产和储存过程的质量控制、产品的真假及产地的鉴别等。展开更多
文摘Usually the research and application for selective excitation do not deal with the excitation state which varies with time and can be controlled by external voltage with time. This paper analyzes the se-lective excitation rate by electron impact on the basis of atomic collision physics. The external pulse control method was used to control the electron energy in ionized gases successfully. It has been obtained that the se-lective excitation can be varied with time by controlling the electron energy. The effect of selective excitation was detected by measuring relative spectral intensity distribution. The results of this paper have established the necessary fundamentals for realization and application of variable color luminescence in ionized gases.
文摘利用激发塑型(exc itation scu lpting)方法,结合多频率选择性激发的形状脉冲(shaped pu lse)、13C CPD去偶和修整脉冲(trim pu lse)等手段进行多个(重)强峰的压制,测试了市售白酒的各种1H核磁共振谱图,并根据样品性质对脉冲序列中的各种参数进行了优化。在压制了其中水和乙醇峰后得到的一维、二维谱图中,清晰地呈现了各个微量组分的谱峰以及反映各组分化学结构的相关峰,据此对图谱中各个谱峰进行了指认。实验表明这种方法对酒类产品的分析研究非常有效,可以应用于酒类生产和储存过程的质量控制、产品的真假及产地的鉴别等。
