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Method for detecting rotational wave packet of molecule

A molecular rotation and wave packet technology, applied in materials excitation analysis and other directions, can solve problems such as inability to distinguish different molecules, and achieve the effect of high accuracy and wide practicability

Inactive Publication Date: 2018-12-21
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, using the momentum distribution of fragment ions to calibrate molecular rotational wave packets cannot distinguish different molecules

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  • Method for detecting rotational wave packet of molecule
  • Method for detecting rotational wave packet of molecule
  • Method for detecting rotational wave packet of molecule

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[0022] Specific implementation examples

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] The present invention provides a method for extracting molecular rotational wave packets by measuring the molecular high-order harmonic angle distribution under different time delays, such as figure 1 As shown, it specifically includes: firstly, using two femtosecond laser pulses with a certain time delay (the first pump light and the second pump light) to excite molecules to generate unidirectional rotating molecular beams. Specifically: the first pump light excites the molecules so that the molecules are periodically arranged, and then when the mo...

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Abstract

The invention discloses a method for detecting a rotational wave packet of a molecule, which comprises the following steps: exciting a molecule by using two beams of pumping light having a fixed timedelay to obtain a unidirectional rotational molecular beam; using a beam of probe light to act on the rotational molecular beam, and producing higher harmonics containing molecular rotational wave packet information; collecting a higher harmonic spectrum under different time delays and different polarization angles of the probe light and the pumping light; and deconvolving the higher harmonic spectrum to obtain rotational wave packet of the molecule. The method for detecting a rotational wave packet of a molecule in the invention proposes a method for acquiring the molecular rotational wave packet information by detecting the higher harmonics, which is a simple and effective method with broad applicability for simultaneously detecting an electronic dynamics process of an attosecond time scale and a nuclear dynamic process of a femtosecond time scale.

Description

technical field [0001] The invention relates to the technical field of ultrafast dynamics measurement, in particular to a method for detecting molecular rotational wave packets. Background technique [0002] Molecules can rotate like a mechanical rotor when subjected to a rotational torque. In recent years, the use of ultrashort laser pulses to excite molecules to rotate in a specific direction, that is, the molecules rotate in one direction, has attracted great interest. Experimentally, molecular unidirectional rotation can be induced by two time-delayed laser pulses, a chiral pulse train, or a polarization-decorated laser pulse excitation. The unidirectional rotation of molecules is of great significance to the formation of gas vortices, the modification of molecular surface scattering and the deflection of molecular polarization. Therefore, real-time observation of the evolution of molecular rotational wave packets is crucial for a deep understanding and control of the ...

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Application Information

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IPC IPC(8): G01N21/63
CPCG01N21/63
Inventor 兰鹏飞何立新翟春洋王保宁陆培祥
Owner HUAZHONG UNIV OF SCI & TECH
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