Investigation of MM and Sub-MM Waves Absorption using the Methods of Precise Resonator Spectroscopy

Abstract

Investigation of continuum absorption (CA) depending on humidity in a mixture of nitrogen and water vapor at the atmospheric pressure has been conducted within 100-210 GHz frequency range at two temperatures: 297 K and 274.5 K using resonator spectrometer. Linear and square humidity parts of the continuum absorption have been separated from the experimental data and values of corresponding parameters have been determined for each temperature. Temperature dependence of the parameters obtained has been estimated. Comparative analysis of the data obtained and results of previous theoretical and experimental studies is presented. The estimation calculations of CA are presented for 269.5 K. The behavior of CA measured is in good agreement with previous measurements and modern conception, but CA temperature dependence is stronger than in previous publications [3-6]. It is concerned with CA properties.