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Method for detecting ultrafast dynamical process of attosecond atom and molecule

A detection method and atomic technology, which can be applied to measurement devices, instruments, etc., can solve the problems of continuous changes, affect the accuracy of real-time detection of molecular dynamics, and cannot realize wavelengths, and achieve the effect of high control accuracy.

Inactive Publication Date: 2012-06-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not easy to change the laser wavelength experimentally, especially the continuous change of wavelength cannot be realized experimentally.
In this way, the time delay cannot be changed continuously, which affects the accuracy of real-time detection of molecular dynamic processes.

Method used

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  • Method for detecting ultrafast dynamical process of attosecond atom and molecule
  • Method for detecting ultrafast dynamical process of attosecond atom and molecule
  • Method for detecting ultrafast dynamical process of attosecond atom and molecule

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] Example 1: Control of double ionization collision time of hydrogen molecules by orthogonal two-color field

[0016] Such as figure 1 As shown, the orthogonal field used is 800nm+400nm, and the intensity is 1.0×10 14 W / cm 2 ; Orthogonal two-color field of 1600nm+800nm ​​is also used, the intensity is 0.5×10 14 W / cm 2 . figure 2 A physical schematic diagram of the control process is given, Indicates relative phase. The solid line is the electric field in the y direction, and the dashed line is the resultant electric field intensity. In different relative phases, the peak time of the resultant electric field intensity is different. Therefore, the timing of the first electron ionization varies. Since the collision time is a function of the first electron ionization time, a shift in the first electron ionization time results in a change in the collision time. Therefore, by adjusting the relative phase of the orthogonal two-color field, the time of the first electr...

example 2

[0018] Study on non-sequential double ionization of helium atom by using orthogonal two-color field. The laser field used is an orthogonal field of 800nm+400nm, and the laser intensity is 4.0×10 14 W / cm 2 . The collision time is controlled by changing the relative phase to study the correlation properties of electron pairs that are double ionized due to collisions at different times. Figure 5 The electron momentum spectra of double ionized electrons in the positive direction of 800nm ​​laser under different relative phases are given. It can be seen that with the increase of the relative phase, the electron distribution shifts from the second and fourth quadrants to the first and third quadrants, indicating that the electron correlation characteristics change from anti-correlation to positive correlation.

example 3

[0020] The present invention calculates the control effects of orthogonal two-color fields with different wavelength ratios and different intensity ratios on time delay, as shown in Table 1. When the wavelength ratio is 1:1, the double ionization signal is weak, and the delay time is uncontrollable. When the intensity ratio is 2:1, 3:1, 4:1, the time control accuracy is 160 attoseconds, 200 attoseconds and 220 attoseconds for every 0.1π change in the relative phase, so when the wavelength ratio is 2 : When 1, the control precision of the delay time is the highest. Changing the laser intensity ratio, it is found that when the intensity ratio is 2:1, collisions occur in a wide time range, and the purpose of precisely controlling the delay time is not achieved, and when the intensity ratio is 1:2, the interference signal is too strong , and when the intensity ratio is 1:1, the control effect is the best. See Table 1 for the comparison results of specific examples.

[0021] Tab...

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Abstract

The invention provides a method for detecting the ultrafast dynamical process of an attosecond atom and molecule. The method comprises the following steps of: focusing two beams of linear polarized light with different orthogonal frequencies in a polarization direction onto a gas medium; adjusting relative phases of the two beams of light; measuring electronic and / or ion momentum of the atom or the molecule generated through double ionization under different relative phases; and obtaining the ultrafast dynamical process according to electronic and / or ion momentum information. The method has high control precision on the delay time, and the relative phase changes 0.1 phi each time, the change of the delay time can be less than 200 attoseconds, so that the attosecond real-time detection of the ultrafast dynamical process in which a strong field interacts with the atom and the molecule is realized.

Description

technical field [0001] The invention relates to the field of interaction between strong-field lasers and atoms or molecules, in particular to a detection method capable of realizing ultrafast dynamic processes of atoms and molecules on the order of attoseconds. Background technique [0002] With the development of quantum mechanics, people have a relatively in-depth understanding of the static structure of atoms and molecules, such as atomic energy levels and molecular orbitals. But the understanding of the dynamic process of atoms and molecules, especially the ultrafast dynamic process in strong field laser, is still very unclear. For example, the change of electron vacancies in the process of strong field ionization, the localized distribution of electrons in the process of dissociation, and the movement process of molecular nuclei, etc. The detection of these ultrafast dynamical processes is one of the frontiers of science today. [0003] The electrons ionized by the li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/00
Inventor 周月明陆培祥
Owner HUAZHONG UNIV OF SCI & TECH