Numerical study of spectral intensity of emission and absorption of the CO2 and CO molecules under vibrationally nonequilibrium conditions

Radiation of vibrationally nonequilibrium carbon dioxide in the 12 to 19 μm region

“…The radiation intensity and absorptivity A were calculated by a procedure described elsewhere [12,13]. The averaged I(03C9) and A(w) values were determined in the wave number range dcv = 1-10 cm-1.…”

“…Application of the isolated line model to the calculation of radiation intensity in the P and R-branches is jùstified in the pressure range P 0.1 atm and optical path lengths X 1.0 atm. cm, because under these conditions the rotational line width is one-two orders of magnitude smaller than the distance between the adjacent lines in the band [12,13]. In determining the absorptivity in the P, R-branches of the 15 pm band we used a model [21] assuming a random line distribution in the spectrum and…”

“…The values of A(co) in the P and R-branches calculated for the conditions considered in this work using the statistical and isolated line models agree to within 5 %. The equivalent width of the Voigt-contoured rotational lines were determined by the procedure described in [11][12][13]. The initial parameters for such calculations are the integrated line intensity Sv'J'~v"J" = +~-~ Kv'J'~v"J"(03C9) de) and the line halfwidth y.…”

“…It can be done both by analytical [2] and numerical [1] methods. Radiation intensity and absorptivity of carbon dioxide have been calculated at 4.3 ym in [3][4][5][6][7][8][9][10][11][12][13], at 2.7 pm in [6, 10-13] and at 15 ym in [10] with harmonic oscillator-rigid rotor approximation for determination of rotational lines intensities and spectral distribution for the conditions, where nonequilibrium Boltzmann population distribution in vibrational modes occurrs.…”