Laser diagnostics of equilibrium a CO2: N2 gas mixture

Multifrequency laser diagnostics of vibrational nonequilibrium gas media containing CO2 molecules

“…The developed technique for multifrequency diag nostics of vibrational nonequilibrium gas mixture con taining CO2 molecules was also applied to the analysis of actual experimental data, i.e., results of measure ments of unsaturated gains in the active medium of a transversely excited CO2 laser at a pressure of 80 Torr at lines of Pand R-branches of primary laser transi tions 0001-[1000, 0200]I,II and transitions of the first sequential band 0002-[1001, 0201]I,II [22]. From the data presented in [22], the 10P(12), 10P(20), 9P(18), 9P (22), 9R(10), 9R(12), 9R (18), and 9R(24) lines of the 0001-[1000, 0200]I,II transitions and 10P(15), 10P(25), 10R(31), and 9R(17) lines of the 0002-[1001,0201]I,II transitions with measured abnormal gains were excluded, as well as 10P( 14), 10P (18), 10P(28), 10P(34), 9P (10), 9R (14), 9R(30), and 9R(32) lines of the 0001-[1000,0200]I,II transitions, which are overlapped with lines of hot 1110-0111, 0310-0111 transitions (see, e.g., [13]). We have calcu lated the translational temperature of the active medium and populations of laser vibrational levels 0001, 1000, 0200, 0002, 1001, and 0201: T =(366.8±0.…”

“…The diagnostics of vibrational nonequilibrium gas media is performed by different methods, having dif ferent capabilities and application conditions (see, e.g., [9,10]). The method of laser spectrograph with the use of a frequency-stabilized tunable CO2 laser as a source of sensing radiation is the most adequate and convenient for diagnostics of both equilibrium and nonequilibrium gas media containing CO2 molecules [11][12][13][14].…”

Collisional self-broadening coefficients and probabilities of spontaneous emission of the CO2 1000–0001 transition lines

“…Determination of carbon dioxide concentration in the atmosphere and in gaseous products of combus tion of hydrocarbon fuels by optical methods, simula tions of radiative transfer in the atmosphere, and diag nostics of active media of high-power Co2 lasers, requires the knowledge of such Co2 spectral line parameters as collisional self-broadening coefficients and probability of spontaneous emission [1][2][3][4]. The problem of the experimental determination of these parameters for the 1000-0001 transition lines is facili tated by the possibility of using methods that apply a tunable Co2 laser as a probing radiation.…”