“…In 1940 bands of diatomic calcium chloride were observed in the spectra of cool stars, especially carbon stars, by Sanford [14, 151. Identification of CaCl in the spectra of carbon stars was subsequently made by Bidelman [16] in 1954, Gordon E171 in 1967, Greene [18] in 1972 and Rybski [19] in 1973. The red band system of CaCl occurs in a relatively free spectral region with few strong overlapping bands from other molecules such as for example C2.…”