Identification of H${}_2$CCC as a diffuse interstellar band carrier

J. P. Maier, G. A. H. Walker, D. A. Bohlender +5

We present strong evidence that the broad, diffuse interstellar bands (DIBs) at 4881 and 5450\,Åare caused by the $B{}^1$B${}_1$\,$\leftarrow$\,$X{}^1$A${}_1$ transition of H${}_2$CCC (l…