|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5427000||1397241||2018||8 صفحه PDF||ندارد||دانلود رایگان|
â¢Collision induced bands of carbondioxide were recorded for different densities and temperatures.â¢The temperature dependence of collision induced bands has been studied.â¢Integrated band intensities have been provided for Venusâ atmosphere.â¢The role of dimers in collision induced bands is discussed.
The intensity and temperature dependence of four CO2 collision induced absorption (CIA) bands in two spectral regions, 1100â1600â¯cmâ1 and 2500â3200â¯cmâ1 have been investigated. The measurements have been performed with a Fourier Transform InfraRed (FT-IR) spectrometer operating in a wide spectral range, from 350 to 25000â¯cmâ1 (0.4 to 28.5â¯Âµm) with a spectral resolution of 2â¯cmâ1, interfaced with a high pressure-high temperature (HP-HT) absorption cell with an optical path of about 2Â cm. While the integrated band intensity of allowed bands shows a linear dependence versus density, the collision-induced integrated band intensity increases quadratically with the density, due to the absorption by pairs of molecules, which allows identifying the CIA bands unambiguously. While below 300Â K the binary integrated absorption coefficients exhibit a pronounced temperature dependence due to the presence of dimers, a much weaker temperature dependence has been found above 300Â K. The results are important for the radiative transfer calculations of Venusâ atmosphere. The integrated band intensities of the studied bands have been calculated for Venusâ atmosphere from 40â¯km down to the surface by extrapolating the binary integrated absorption coefficients to the relevant temperatures.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 204, January 2018, Pages 242-249