Reflectance of Rhenium as a Function of Pressure in a Diamond Anvil Cell

TL;DR

This study measures how rhenium's reflectance changes under high pressure in a diamond anvil cell and discusses methods to improve measurement accuracy at pressures up to 100 GPa.

Contribution

It provides the first detailed analysis of rhenium's reflectance under high pressure and proposes procedures to address measurement challenges in DAC experiments.

Findings

Reflectance of rhenium can be accurately measured up to 100 GPa.

Visual inspection reveals challenges in obtaining precise reflectance data.

Knowledge of rhenium's reflectance helps mitigate diamond absorption issues.

Abstract

We have measured the reflectance of rhenium in the visible region to pressures up to 100 GPa in a diamond anvil cell (DAC). By photographing the reflecting surface, we visually show that there are challenges to obtaining accurate values in a DAC for several reasons and propose some useful procedures. We also show that knowledge of the reflectance of rhenium can overcome the problem of absorption of light by diamonds when studying the reflectance of materials at high pressure in a DAC.