Laser probe molecular resonance excitation detection method for isotopes

A laser probe and molecular resonance technology, which is applied in the field of plasma emission spectroscopy, can solve the problems of weak molecular spectral intensity, inability to detect isotopes, and low detection sensitivity, so as to reduce sample damage, achieve minimal damage or even non-destructive Detection, the effect of large wavelength interval of spectral lines

Active Publication Date: 2018-11-23
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

However, molecular spectroscopy has problems such as weak spectral intensity, low detection sensitivity and complex subsequent quantitative algorithms, making it impossible to achieve fast and highly sensitive isotope detection
[0010] To sum up, in view of the scientific and technical problems of weak signal in spectral detection, research and development of an isotopic laser probe molecular resonance excitation detection method can greatly improve the signal intensity and detection sensitivity of its molecular spectrum, and realize isotopic detection. The rapid and accurate detection of laser probes has important scientific value and application prospects

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  • Laser probe molecular resonance excitation detection method for isotopes
  • Laser probe molecular resonance excitation detection method for isotopes
  • Laser probe molecular resonance excitation detection method for isotopes

Examples

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Embodiment 1

[0044] Taking the detection of boron-10 isotope in boric acid as an example, the method is described in detail.

[0045] The sample selected in this embodiment is boric acid, and boron-10 accounts for 1%-99% of the atomic content of boron.

[0046] The Brilliant laser from Quantel Company in France and the Vibrant wavelength tunable laser from OPOTEK Company in the United States were selected as the laser, and the SCT320 spectrometer (frequency 10 Hz, pulse width) from Princeton Instrument Company was selected as the spectrometer. Select the ν=0 vibration level electrons in the B2Π energy band of the boron-oxygen molecule (10BO) as the target excited electrons, and the 244.02nm spectral line in the B2Σ(υ=0)→X2Σ(υ=1) energy band of the boron-oxygen molecule (10BO) To excite the line, and adjust the wavelength of the wavelength tunable laser to 244.02nm.

[0047] (1) Turn on the Brilliant laser, output the laser, the beam is reflected by the mirror, and focused at 2mm below the...

Embodiment 2

[0053] Taking the detection of boron-10 isotope boron-11 in boric acid as an example, the method will be described in detail.

[0054] The sample selected in this embodiment is boric acid, and boron-11 accounts for 1%-99% of the atomic content of boron.

[0055] The Brilliant laser from Quantel Company in France and the Vibrant wavelength tunable laser from OPOTEK Company in the United States were selected as the laser, and the SCT320 spectrometer from Princeton Instrument Company was selected as the spectrometer. Select the ν=0 vibration level electrons in the B2Π energy band of the boron-oxygen molecule (11BO) as the target excited electrons, and the 243.69nm spectral line in the B2Σ(υ=0)→X2Σ(υ=1) energy band of the boron-oxygen molecule (11BO) To excite the line, adjust the wavelength of the wavelength tunable laser to 243.69nm.

[0056] (1) Turn on the Brilliant laser, output the laser, the beam is reflected by the mirror, and focused at 2mm below the sample surface throu...

Embodiment 3

[0062] Taking the detection of carbon-12 isotope in urea as an example, the method is described in detail.

[0063] The selected sample is urea, and the carbon-12 accounts for 1%-99% of the atomic content of the carbon element.

[0064] The Brilliant laser from Quantel Company in France and the Vibrant wavelength tunable laser from OPOTEK Company in the United States were selected as the laser, and the SCT320 spectrometer from Princeton Instrument Company was selected as the spectrometer. Select the ν=1 vibration level electrons in the carbon nitrogen (12CN) B2Π energy band as the target excited electrons, and the 387.14nm spectral line in the carbon nitrogen (12CN) B2Σ(υ=1)→X2Σ(υ=1) energy band is The line was excited and the wavelength tunable laser was tuned to 387.14 nm.

[0065] (1) Turn on the Brilliant laser, output the laser, the beam is reflected by the mirror, and focused at 2mm below the sample surface through an ultraviolet-grade quartz lens, ablation the surface ...

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Abstract

The invention discloses a laser probe molecular resonance excitation detection method for isotopes and belongs to the field of laser plasma emission spectroscopy. The method comprises the following steps: adopting laser for ablating a sample and generating corresponding compound molecules through the reaction between to-be-detected nuclides in the sample and gas molecules in environment gas; adjusting a wavelength tunable laser to the wavelength required by stimulated transition of electrons of the molecules, outputting laser and irradiating the plasma; triggering radiative transition of the electrons in the molecules, emitting fluorescent light, collecting the emitted fluorescence spectrum and recording, and performing qualitative or quantitative analysis on the to-be-detected nuclides. According to the method, spectral peak signals of the to-be-detected nuclides in the compound molecule are specifically enhanced under the condition that the matrix spectrum is almost not influenced, and the interference of other nuclides can be effectively eliminated, so that the quick and accurate detection of the isotopes through a laser probe can be realized.

Description

technical field [0001] The invention belongs to the field of laser plasma emission spectroscopy, in particular to a method for isotope laser probe molecular resonance excitation detection. This method can effectively enhance and distinguish the spectral signals of the isotopes in the plasma, and realize the rapid and accurate detection of the isotopes by the laser probe. Background technique [0002] Different nuclides of the same element with the same number of protons and different numbers of neutrons are isotopes of each other, such as 1H, 2H, and 3H are isotopes of each other, and they are all isotopes of hydrogen. Isotopes have important uses in industrial and agricultural production, environmental protection and scientific research. For example, 2H and 3H are materials for making hydrogen bombs; 14C is the basis for radiocarbon dating; 235U is a material for making atomic bombs and raw materials for nuclear reactors; Tracking technology is used to study the rational u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/63G01N21/64
CPCG01N21/63G01N21/64G01N2021/637
Inventor 郭连波崔灏灏马镱文朱志豪唐云唐仕松李嘉铭陆永枫曾晓雁
Owner HUAZHONG UNIV OF SCI & TECH
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