The conformational states of diglyme in both the solid and liquid states have been determined by an integrated use of both IR and Raman spectroscopy together with ab initio/density functional theory (DFT) calculations. Using knowledge from diglyme also made possible the study of the conformational state of longer glymes, including a quantitative study of the D-LAM mode. We hereby unambiguously can assign the (tgt)(n) conformational state to all glymes and PEO in the solid state.