A Phase Reconstruction Method in Two-Dimensional Fourier Transform Electron Spectroscopy

A technology of Fourier transform and electron spectroscopy, applied in the field of phase reconstruction in two-dimensional Fourier transform electron spectroscopy, can solve problems such as small phase errors, and achieve the effect of eliminating the spectral phase slope

Inactive Publication Date: 2018-06-12
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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Problems solved by technology

The problem, however, is that such methods of phase determination do not operate in the nonlinear interaction region of the sample, where transmission effects in the sample may introduce small phase errors

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  • A Phase Reconstruction Method in Two-Dimensional Fourier Transform Electron Spectroscopy
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  • A Phase Reconstruction Method in Two-Dimensional Fourier Transform Electron Spectroscopy

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Embodiment Construction

[0057] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0058] It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the compo...

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Abstract

The invention provides a phase reconstruction method in a two-dimensional Fourier transform electronic spectrum. The method at least comprises the following steps: carrying out inversion calculation on spectral interference and an inverse Fourier transform on a frequency modulated interference spectrum D(omega t, tau), filtering off direct current and alternating current terms in a time domain, then carrying out a discrete Fourier transform on the alternating current term to retrieve frequency domains, regaining S0 (omega t) and f (omega t), and calculating through S0 (omega t) and f (omega t) to obtain amplitudes of local oscillation pulses and amplitudes and phases of photon echo signals. According to the invention, phase error sources are analyzed and inquired to find that phase errors of 2DES (Two-Dimensional Electronic Spectroscopy) have some relevance to zero delay determining errors of coherence time and detection, time linear dependence of coherence and phases on an emission axis along with emission frequencies is effectively eliminated, and a real two-dimensional absorption spectrum is further reconstructed.

Description

technical field [0001] The invention relates to the field of phase correction of a spectrometer, in particular to a phase reconstruction method in a two-dimensional Fourier transform electronic spectrum. Background technique [0002] As an effective detection method in ultrafast spectroscopy, Two-Dimensional Electronic Spectroscopy (2DES) has been successfully used to detect ultrafast dynamics information of a series of basic processes such as electron and vibration coupling in complex systems. However, there are still three major technical challenges in the implementation of two-dimensional electron spectroscopy: First, because the excitation wavelength ranges from ultraviolet to near-infrared, it is very difficult to achieve phase stability in the sub-wavelength range. Complex and fine device design to solve, mainly including passive phase stabilization and active phase stabilization; secondly, in the detection direction, the superposition between the scattering from the s...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/28
CPCG01J3/28
Inventor 江玉海张凯旋张逸竹孟秋香
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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