 A year later this effect was worked out in detail by Renner.Herzberg refers to this as the “Renner-Teller” effect in one of his influential books, and this name is most commonly used, although it might be more appropriate to speak of the “Renner-Herzberg” or “Renner-Herzberg-Teller” effect as Herzberg was the first author on the 1933 paper.While Renner's theoretical study concerned the linear triatomic molecule CO2, the first actual observation of the Renner–Teller effect was in the electronic absorption spectrum of NH2 and its isotopologue ND2.