Anti-Stokes/Stokes temperature calibration and its application in laser-heating diamond anvil cells

doi:10.1088/1674-1056/accd55

中国物理B ›› 2023, Vol. 32 ›› Issue (9): 90704-090704.doi: 10.1088/1674-1056/accd55

Anti-Stokes/Stokes temperature calibration and its application in laser-heating diamond anvil cells

Minmin Zhao(赵旻旻), Binbin Wu(吴彬彬), Jingyi Liu(刘静仪), and Li Lei(雷力)^†

Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China

收稿日期:2023-01-17 修回日期:2023-04-02 接受日期:2023-04-17 发布日期:2023-09-07
通讯作者: Li Lei E-mail:lei@scu.edu.cn
基金资助:
This work was financially supported by the National Natural Science Foundation of China (Grant No. U2030107) and the Fundamental Research Funds for the Central Universities (Grant No. 2020SCUNL107).

Anti-Stokes/Stokes temperature calibration and its application in laser-heating diamond anvil cells

Minmin Zhao(赵旻旻), Binbin Wu(吴彬彬), Jingyi Liu(刘静仪), and Li Lei(雷力)^†

Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China

Received:2023-01-17 Revised:2023-04-02 Accepted:2023-04-17 Published:2023-09-07
Contact: Li Lei E-mail:lei@scu.edu.cn
Supported by:
This work was financially supported by the National Natural Science Foundation of China (Grant No. U2030107) and the Fundamental Research Funds for the Central Universities (Grant No. 2020SCUNL107).

摘要/Abstract

摘要： Anti-Stokes/Stokes Raman peak intensity ratio was used to infer sample temperatures, but the influence factors of system correction factors were not clear. Non-contact in-situ anti-Stokes/Stokes temperature calibration was carried out for up to 1500 K based on six different samples under two excitation light sources (±50 K within 1000 K, ±100 K above 1000 K), and the system correction factor γ was systematically investigated. The results show that the correction factor γ of anti-Stokes/Stokes thermometry is affected by the wavelength of the excitation light source, Raman mode peak position, temperature measurement region and other factors. The anti-Stokes/Stokes thermometry was applied to the laser-heating diamond anvil cell (LHDAC) experiment to investigate the anharmonic effect of hBN under high temperature and high pressure. It is concluded that the strong anharmonic effect caused by phonon scattering at low pressure gradually changes into the predominance of localized molecular lattice thermal expansion at high pressure.

关键词: Stokes/anti-Stokes Raman spectroscopy, temperature calibration, laser-heating diamond anvil cell (LHDAC), anharmonic effect

Abstract: Anti-Stokes/Stokes Raman peak intensity ratio was used to infer sample temperatures, but the influence factors of system correction factors were not clear. Non-contact in-situ anti-Stokes/Stokes temperature calibration was carried out for up to 1500 K based on six different samples under two excitation light sources (±50 K within 1000 K, ±100 K above 1000 K), and the system correction factor γ was systematically investigated. The results show that the correction factor γ of anti-Stokes/Stokes thermometry is affected by the wavelength of the excitation light source, Raman mode peak position, temperature measurement region and other factors. The anti-Stokes/Stokes thermometry was applied to the laser-heating diamond anvil cell (LHDAC) experiment to investigate the anharmonic effect of hBN under high temperature and high pressure. It is concluded that the strong anharmonic effect caused by phonon scattering at low pressure gradually changes into the predominance of localized molecular lattice thermal expansion at high pressure.

Key words: Stokes/anti-Stokes Raman spectroscopy, temperature calibration, laser-heating diamond anvil cell (LHDAC), anharmonic effect

中图分类号: (High-pressure apparatus; shock tubes; diamond anvil cells)

07.35.+k

33.20.Fb (Raman and Rayleigh spectra (including optical scattering) ?) 06.20.fb (Standards and calibration) 63.20.Ry (Anharmonic lattice modes)

Minmin Zhao(赵旻旻), Binbin Wu(吴彬彬), Jingyi Liu(刘静仪), and Li Lei(雷力). Anti-Stokes/Stokes temperature calibration and its application in laser-heating diamond anvil cells[J]. 中国物理B, 2023, 32(9): 90704-090704.

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Anti-Stokes/Stokes temperature calibration and its application in laser-heating diamond anvil cells

Anti-Stokes/Stokes temperature calibration and its application in laser-heating diamond anvil cells

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