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

doi:10.1088/1674-1056/accd55

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.

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

Received: 17 January 2023
Revised: 02 April 2023
Accepted manuscript online: 17 April 2023

PACS:	07.35.+k	(High-pressure apparatus; shock tubes; diamond anvil cells)
	33.20.Fb	(Raman and Rayleigh spectra (including optical scattering) ?)
	06.20.fb	(Standards and calibration)
	63.20.Ry	(Anharmonic lattice modes)

Fund: 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).

Corresponding Authors: Li Lei
E-mail: lei@scu.edu.cn

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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 2023 Chin. Phys. B 32 090704

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

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