CN103776894A - 一种测量超快过程的方法 - Google Patents

一种测量超快过程的方法 Download PDF

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CN103776894A
CN103776894A CN201410037503.6A CN201410037503A CN103776894A CN 103776894 A CN103776894 A CN 103776894A CN 201410037503 A CN201410037503 A CN 201410037503A CN 103776894 A CN103776894 A CN 103776894A
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threshold ionization
pulse
omega
threshold
frequency
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CN103776894B (zh
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向阳
郭辉
冯红梅
陈玮
李亚
王利红
许媛
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Henan University of Technology
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Abstract

本发明涉及一种测量超快过程的方法,该方法包括如下步骤:泵浦脉冲制备相干叠加态原子或分子;探测脉冲与处于相干叠加态的原子或分子气体相互作用,产生阈上电离谱;td为探测脉冲与泵浦脉冲之间的延时,当td变化时,阈上电离谱的强度将会产生显著的变化,变化的周期与电子波包振动频率(ωeg)相同,即通过观察阈上电离谱的强度可测量电子的运动;所述阈上电离谱的测量可通过冷靶反冲离子动量谱仪来测量;所述泵浦脉冲与探测脉冲可用飞秒激光器来实现,泵浦脉冲的中心频率为(ωeg),探测脉冲频率在近红外波段。

Description

一种测量超快过程的方法
技术领域
本发明涉及一种测量超快过程的方法,属于测量领域。
背景技术
超快过程指发生在很短时间尺度内(小于10-15秒)的动力学行为。阈上电离指原子或分子吸收多于所需最少数目的光子而电离。
发明内容
本发明涉及一种测量超快过程的方法,
(1)泵浦脉冲用于制备相干叠加态原子或分子。
(2)探测脉冲与处于相干叠加态的原子或分子气体相互作用,产生阈上电离谱。
(3)td为探测脉冲与泵浦脉冲之间的延时,当td变化时,阈上电离谱的强度将会产生显著的变化,变化的周期与电子波包振动频率(ωeg)相同,即通过观察阈上电离谱的强度可测量电子的运动。
所述阈上电离谱的测量可通过冷靶反冲离子动量谱仪来测量。
所述泵浦脉冲与探测脉冲可用飞秒激光器来实现。泵浦脉冲的中心频率为(ωeg),探测脉冲频率在近红外波段。
附图说明
通过参照附图更详细地描述本发明的示例性实施例,本发明的以上和其它方面及优点将变得更加易于清楚,在附图中:
图1为本发明的一种测量超快过程的方法的测量电子运动原理示意图。
具体实施方式
在下文中,现在将参照附图更充分地描述本发明,在附图中示出了各种实施例。然而,本发明可以以许多不同的形式来实施,且不应该解释为局限于在此阐述的实施例。相反,提供这些实施例使得本公开将是彻底和完全的,并将本发明的范围充分地传达给本领域技术人员。
在下文中,将参照附图更详细地描述本发明的示例性实施例。
一个处于二能级相干态的原子或类原子的系统中,电子的波函数ψ(r,t)表示为
ψ ( r , t ) = a φ g ( r ) e - i ω g t + b φ e ( r ) e - i ω e t - - - ( 1 )
式中,r为空间位置矢量,φg(r)和φa(r)分别为基态和激发态的波函数,a和b分别为基态和激发态的振幅,ωg和ωe分别为基态和激发态电子能量(ωeg)。在微观领域,跟踪电子的运动,是指跟踪电子波包的运动,即电子空间概率分布随时间的变化情况,表示为,
|ψ(r,t)|2=|aφg(r)|2+|bφe(r)|2+2|abφe(r)φg(r)|cos[(ωeg)t],   (2)
由(2)式可知,只要探测到|ψ(r,t)|2的变化频率(ωeg),就可跟踪电子的运动。图1给出了测量电子运动原理示意图。
(1)泵浦脉冲用于制备相干叠加态原子或分子。
(2)探测脉冲与处于相干叠加态的原子或分子气体相互作用,产生阈上电离谱。
(3)td为探测脉冲与泵浦脉冲之间的延时,当td变化时,阈上电离谱的强度将会产生显著的变化,变化的周期与电子波包振动频率(ωeg)相同,即通过观察阈上电离谱的强度可测量电子的运动。
所述阈上电离谱的测量可通过冷靶反冲离子动量谱仪来测量。
所述泵浦脉冲与探测脉冲可用飞秒激光器来实现。泵浦脉冲的中心频率为(ωeg),探测脉冲频率在近红外波段。
以上所述仅为本发明的实施例而已,并不用于限制本发明。本发明可以有各种合适的更改和变化。凡在本发明的精神和原则之内所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (1)

1.一种测量超快过程的方法,其特征在于该方法包括如下步骤:
(1)泵浦脉冲制备相干叠加态原子或分子;
(2)探测脉冲与处于相干叠加态的原子或分子气体相互作用,产生阈上电离谱;
(3)td为探测脉冲与泵浦脉冲之间的延时,当td变化时,阈上电离谱的强度将会产生显著的变化,变化的周期与电子波包振动频率(ωeg)相同,即通过观察阈上电离谱的强度可测量电子的运动;
所述阈上电离谱的测量可通过冷靶反冲离子动量谱仪来测量;
所述泵浦脉冲与探测脉冲可用飞秒激光器来实现,泵浦脉冲的中心频率为(ωeg),探测脉冲频率在近红外波段。
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CN108680944A (zh) * 2018-03-19 2018-10-19 华中科技大学 一种探测电子运动的方法
CN108827464A (zh) * 2018-06-27 2018-11-16 华中科技大学 一种测量激光强度的方法
CN108961962A (zh) * 2018-07-13 2018-12-07 武汉工程大学 一种利用单光子单电离机制重构电场包络的方法
CN109612591A (zh) * 2018-12-12 2019-04-12 汕头大学 单脉冲电离极短时间自测量方案

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108680944A (zh) * 2018-03-19 2018-10-19 华中科技大学 一种探测电子运动的方法
CN108680944B (zh) * 2018-03-19 2020-07-14 华中科技大学 一种探测电子运动的方法
CN108827464A (zh) * 2018-06-27 2018-11-16 华中科技大学 一种测量激光强度的方法
CN108961962A (zh) * 2018-07-13 2018-12-07 武汉工程大学 一种利用单光子单电离机制重构电场包络的方法
CN109612591A (zh) * 2018-12-12 2019-04-12 汕头大学 单脉冲电离极短时间自测量方案
CN109612591B (zh) * 2018-12-12 2020-10-16 汕头大学 单脉冲电离极短时间自测量方案

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