Shock-tube study of HCN self-broadening and broadening by argon for the P(10) line of the ν1 band at 3 μm |
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| Authors: | AY Chang RK Hanson |
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| Institution: | High Temperature Gasdynamics Laboratory, Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, U.S.A. |
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| Abstract: | A tunable infrared diode laser was used to measure the fully resolved absorption line shape of the P(10) line in the ν1 band (10°0–00°0) of HCN for shock-heated mixtures of HCN-Ar at temperatures of 1000, 1500 and 2000 K. The temperature dependence of the collision-broadening coefficients 2γ (cm-1 atm-1, FWHM) were inferred for both self-broadening and broadening by argon. For the assumed form 2γ = 2γ0(T0/T)n the exponent n was determined to be 0.63 ± 0.06 with 2γ0 = 0.11 cm-1atm-1 and T0 = 300 K for argon-broadening in the range 300 < T < 2000 K, and 1.2 ± 0.6 with 2γ0 = 0.68 cm-1atm-1 and T0 = 1000 K for self-broadening in the range 1000 < T < 2000 K. |
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