Showing papers by "Prasad Varanasi published in 1977"
TL;DR: In this article, the absolute intensities of the absorption bands of CFCl3 (Freon-11) and CF2Cl2 (“Freon12”) have been measured at 300°K.
Abstract: The absolute intensities of the i.r. absorption bands, which are located in the atmospheric window region, of CFCl3 (“Freon-11”) and CF2Cl2 (“Freon-12”) have been measured at 300°K. Our best estimates for these parameters are: for CFCl3 (“Freon-11”), Sv = 635±36 cm-2atm-1 (9.2μ band), Sv = 1536±45 cm-2atm-1 (11.8μ band); for CF2Cl2 (“Freon-12”), Sv = 718±14 cm-2atm-1 (8.7μ band), Sv = 1136±22 cm-2atm-1 (9.1μ band), and Sv = 1302±40 cm-2atm-1 (10.9μ band).
35 citations
TL;DR: In this article, the absolute intensity of the v 4 -fundamental of 12 CH 4 was measured at 300°K, using a Lorentz line shape with a hydrogen-broadened halfwidth of 0.2 cm.
Abstract: The absolute intensities of all the J -multiplets between R (13) at 1375cm -1 and P (12) at 1225 cm -1 , in the v 4 -fundamental of 12 CH 4 , have been measured at 300°K. Our values are consistent with published band-intensity measurements and also with the theoretical line strength tabulation by Fox. Spectral transmittance computation using a Lorentz line shape with a hydrogen-broadened half-width of 0.075 cm -1 atm -1 at 300°K for all the lines in the band is in excellent agreement with our experimental data measured with a spectral resolution of 0.2 cm -1 . Our best estimate for the absolute intensity of the band is 145±8 cm -2 atm -1 at STP.
16 citations
TL;DR: In this article, the spectral transmission of IR radiation through the nitrogen-broadened lines of the nu-3 fundamental of N2O has been measured at 154, 202 and 300 K. A value of 1411 + or - 54 per sq cm per atmosphere at STP was obtained for the combined strength of the 2nu2(0) + 2nu3 bands, using the Wilson-Wells-Penner-Weber method.
Abstract: Spectral transmission of IR radiation through the nitrogen-broadened lines of the nu-3 fundamental of N2O has been measured at 154, 202 and 300 K. A value of 1411 + or - 54 per sq cm per atmosphere at STP has been obtained for the combined strength of the nu-3 and nu-2(1) + nu-3 - nu-2(1) bands, using the Wilson-Wells-Penner-Weber method. This value of the combined strength, the relative intensity calculations of Gray Young, the room-temperature data of Toth for nitrogen-broadened half-widths in the nu-1 + nu-3 and 2nu2(0) + nu-3 bands, and the variation of the line width with temperature proposed by Varanasi and Sarangi are shown to yield excellent agreement between the measured and computed spectral transmittance throughout the band.
7 citations