Quantitative determination method of chemical bond characteristic phonon abundance-stiffness-order-lifetime stimulated transition
A chemical bond and phonon technology, applied in the field of spectroscopy, can solve the problems that evolution and function are extremely important, and steady-state methods cannot provide dynamic evolution process and quantitative information of chemical bonds.
Inactive Publication Date: 2020-07-21
YANGTZE NORMAL UNIVERSITY
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Problems solved by technology
However, this method is only applicable to aqueous solutions, and the limitation of the steady-state method is that it cannot provide the dynamic evolution process and quantitative information of chemical bonds, while the three-dimensional chemical bond network composed of a large number of water molecules in a real solution or solid-phase sample is under working conditions. The evolution and function under perturbation are extremely important
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[0032] The present invention will be described in further detail below in conjunction with specific embodiments.
[0033] 1. Solid phonon spectrum
[0034] 1.1nm CeO 2 size effect
[0035] (1) 0.04mol / L Ce(NO 3 ) 3 The solution and 0.04mol / L hexamethyltetramine were mixed and stirred at room temperature, centrifuged after controlling different stirring times (5-24h), and CeO with sizes of 6.1, 7.4, 10, 15, and 25nm were prepared. 2 nanoparticles. Measure 300–800cm with a Raman spectrometer -1 Phonon spectra in the frequency range. The Raman phonon spectrum of the above sample was used as the experimental spectrum, and at the same time, the bulk CeO 2The phonon spectrum is used as a standard reference spectrum.
[0036] (2) After subtracting the background from the experimental spectrum and the reference spectrum, perform area normalization processing respectively, such as figure 1 (a) As shown in the illustration in the lower left corner, the difference between the tw...
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The invention discloses a quantitative determination method for abundance-stiffness-order-life stimulated transformation of chemical bond characteristic phonons. The method comprises the following steps: combining a steady state differential phonon spectrum and a time-resolved pumping ultrafast spectrum to analyze samples; performing integration on the steady state differential phonon spectrum toobtain quantitative information of change of abundance of chemical bond characteristic phonons, change of stiffness, namely a characteristic frequency, and change of structure order degree; analyzingthe time-resolved pumping ultrafast spectrum to obtain the decay lifetime of the abundance or intensity of the characteristic phonons. According to the method disclosed by the invention, two experimental techniques are combined to directly measure an interdependent relationship of stimulated transformation and performance of the chemical bond characteristic phonons. The method can be widely applied to quantitative research of macroscopic properties and microscopic causes of solid and liquid and substances thereof under the effects of a concentration field, a scale field and other external fields.
Description
technical field [0001] The invention belongs to the field of spectroscopy, and in particular relates to a method for quantitatively measuring the abundance-stiffness-order-lifetime transformation of chemical bond characteristic phonons by combining steady-state differential phonon spectroscopy and dynamic ultrafast phonon spectroscopy and its correlation. Background technique [0002] Chemical bond relaxation is the key to modifying the structure and properties of matter. When the medium is in service, the external field will modulate the length and energy of chemical bonds, thereby changing the physical properties of the medium. Therefore, it is difficult to measure the stimulated relaxation of chemical bonds in real time. However, existing detection techniques or numerical methods cannot provide quantitative information or relaxation trends of chemical bond length, bond energy, and the number of chemical bonds participating in the reaction under external stimuli or restri...
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IPC IPC(8): G01N21/63G01N21/65
CPCG01N21/63G01N21/65
Inventor 彭媛杨叶子孙长庆
Owner YANGTZE NORMAL UNIVERSITY