Spectrum of C3

Abstract

The enthalpy of sublimation of C₃ as determined by a second law method using both emission and absorption measurements agrees with total vapor pressure and mass spectrometer measurements. The enthalpy agreement and integrated absorption coefficient measurements demonstrate that the so‐called continuum of C₃ is a pseudocontinuum and involves the same bound states as the discrete Swings bands of C₃(A¹Π_u↔X¹Σ _g⁺). ΔH₀°=188±5 kcal/mole for the sublimation of C₃ yields an oscillator strength for the 4050 A bands of C₃ of 0.13 within a factor of 2.