HIGH TEMPERATURE ABSORPTION STUDIES IN THE INFRARED$^{\ast}$

Abstract

Apparatus for studying the infrared absorption of gases in the temperature range from room temperature to $1000^{deg}C$ has been constructed and used to study $CO_{2}$ and $H_{2}O$ and ammonia to $500^{\circ}C$. The absorption cell is of the Pfund type, with a three-meter optical path length. Platinized, fused quartz mirrors are used inside the cell. The cell was constructed from ordinary steel pipe (12-inch diameter and 43 inches long), and was lined on the inside with procelain. Electrical strip heaters mounted on the outside of the cell permit high temperature to be attained. Auxiliary spectroscopic equipment used in this study will be described. Spectra of the infrared absorption of $CO_{2}$ and $H_{2}O$ at $500^{\circ}C$ will be shown.