Raman Study of 532-Nanometer Laser-Induced Degradation of Red Lead.

ABSTRACT: Red lead is commonly employed as a red pigment in numerous valuable cultural artifacts. Raman spectrometry has been widely employed as the primary tool in many nondestructive studies on red lead. Therefore, it is necessary to evaluate and study the impact of lasers on the pigment. The degradation of red lead induced by a 532 nm laser is investigated using micro-Raman spectroscopy. At room temperature, red lead begins to degrade into β-PbO when the power density of the 532 nm laser reaches approximately 5.1 × 10⁴ W/cm² (laser: 532 nm, objective: 50×). At this point, the temperature at the focus of the sample is estimated to be at least 500 °C, aided by the Raman peak shift of β-PbO. Furthermore, the power density of the laser-induced degradation decreases as the temper

SUBMITTER: Li Y 

PROVIDER: S-EPMC10890575 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature