Shock Waves In Mixtures Research Articles

Abstract Absorption spectra of the Swan band of carbon molecules in a reflected shock wave in mixtures of carbon monoxide and argon and in pure carbon monoxide, have been obtained in the temperature range 5000°–7600°K at pressures of 11·3 to 66·9 atm, using a spectograph of high linear dispersion (2Å/mm). Study of the contour of the individual vibratory lines R 70, R 69 and R 68 in the band (0, 0) and determination of the true width of the spectral lines enabled the effective breadth of the collisions of molecular carbon (C 2) with argon molecules (A) and atomic carbon and atomic oxygen to be calculated, the values of which were: (C 2A) = (68±;5·0) · 10 −16 cm 2; (C 2CO) = (57±;6·0), 10 −6 cm 2; (C 2C: C 2O) = (920±76)·10 −16 cm 2. Measurements of the width of the rotation lines in relation to the quantum number K showed that the observed broadening was independant of K. From the true contour of the spectral lines, ∫ k v d v was determined on this basis and ( R e ) 2 for the electron transit a 3Π g of the carbon molecule was determined, and found to be 0·54±0·03 atomic units. The previously obtained value was (R e) 2 = 0·50±0·04 atomic units, which corresponds to an oscillator strength f e = 0·028.

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