... Errata: FTIR Spectroscopic and Theoretical Study of the Photochemistry of Matrix-isolated Coumarin Volume 83, Issue ... of coumarins from plants belonging to the Umbelliferae family (1–3). After Späth's studies there ... the DFT(B3LYP)/6-311++G(d, p) and MP2/6-31G(d, p) methods ...