Soft X-ray Analysis System for Valence Band Chemical Bonding
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Solution Overview
Problem
Conventional X-ray analysis systems, such as wavelength dispersive X-ray analyzers, cannot simultaneously detect multiple wavelengths, limiting their ability to provide precise information on chemical bonding and electron states in samples, particularly in valence bands, which is crucial for analyzing chemical structures.
Innovation Solution
An X-ray analysis system that includes a production apparatus generating a spectrum with peaks from electron transitions from the valence band to inner shells, allowing for simultaneous detection of multiple wavelengths using a soft X-ray spectrometer, and an analysis apparatus that calculates characteristic information by normalizing peak intensities within regions of interest, enabling precise analysis of chemical bonding and structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wavelength dispersive X-ray analyzer is used to obtain an X-ray spectrum by directing X-ray to a diffraction grating, then the system can analyze chemical bonding information, but the diffraction grating and detector must be moved sequentially, preventing simultaneous detection of multiple wavelengths
Solution Approach 1:
The patent transitions from sequential detection along one dimension (wavelength) to simultaneous detection across multiple dimensions by using a 2D detector array that captures multiple wavelengths at once. The diffraction grating disperses X-rays into different angles, and the 2D detector records all wavelengths simultaneously, converting a 1D sequential measurement into a 2D parallel measurement.
Solution Approach 2:
The detector is divided into multiple detection elements arranged in a 2D array, with each element detecting a specific wavelength range. This segmentation allows parallel detection of multiple wavelengths simultaneously, replacing the sequential scanning mechanism of conventional analyzers.
2Adaptability or versatility
If conventional X-ray analysis systems are used, then the system structure is simple, but the ability to detect multiple wavelengths simultaneously is limited
Solution Approach 1:
The 2D detector array serves multiple functions simultaneously: it detects multiple wavelengths, captures spectral information, and provides spatial resolution. This multi-functionality is achieved through a single component that replaces multiple separate detection systems, increasing versatility while managing complexity.
Solution Approach 2:
The diffraction grating acts as an intermediary that converts wavelength information into spatial information through diffraction. This mediator enables the 2D detector to distinguish between different wavelengths based on their angular dispersion, allowing multi-wavelength detection without requiring complex wavelength-selective components for each detector element.
3Measurement precision
If peak intensities are used directly for analysis, then the analysis process is simple, but the results are affected by variations in X-ray intensity
Solution Approach 1:
The patent transforms the analysis from using absolute peak intensities to using normalized intensity ratios. By dividing the peak intensity by the reference intensity (obtained from the same spectrum), the system changes the parameter from absolute value to relative value, eliminating the effect of overall intensity variations while maintaining analytical precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system enables highly precise analysis of samples by accurately reflecting electron states in valence bands, improving analysis precision and identifying compounds based on characteristic information, independent of X-ray intensity, through simultaneous detection of multiple wavelengths and normalization of peak intensities.
Implementation Method 1
an electron beam is irradiated onto a sample, and an X-ray (characteristic X-ray) emitted from the sample as a result of the irradiation of the electron beam is measured
Implementation Method 2
the spectrum includes a first peak caused by an electron transition from a valence band corresponding to an outer shell to an inner shell
Implementation Method 3
the wavelength dispersive X-ray analyzer obtains an X-ray spectrum by directing an X-ray emitted from the sample to a diffraction grating, producing an X-ray component for each wavelength using the diffraction grating
Implementation Method 4
a diffraction grating having a wavelength dispersing function
Implementation Method 5
a detector which detects an X-ray which spatially spreads after the diffraction
Data Source
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AI summary
The present invention relates to a system and a method for x-ray analysis of a sample (22), more specifically for identifying sample constituents and chemical bonding states. The sample (22) is irradiated with an electron beam (24) from a scanning electron microscope (SEM, 10) such that soft x-rays (26) are generated from the sample (22). These x-rays are characteristic x-rays, their wavelength depends on the electron transition that caused them. Some electron transitions occur from the valance band to an inner shell, other electron transitions occur between inner shells. The generated x-rays (26) impinge on a wavelength dispersive element (30) to form dispersive x-rays (32) which are detected by a detector (34). A data processor (36) analyses the x-ray spectrum and compares peak intensities from different spectral regions of interest (ROI). Peaks relating to electron transitions between inner shells can be used to normalise the peaks relating to electron transitions between the valance band and inner shells.