Abstract Raman and infrared spectra of propylgermane, CH3CH2CH2GeH3, and its Ge-deuterated analog, CH3CH2CH2GeD3, were investigated in their gaseous, liquid and solid states. The normal coordinate treatment was carried out by density functional theory (DFT) calculation, using B3LYP/6-31G∗ and 6-311++G∗∗ basis sets, and the corresponding fundamental vibrations were assigned. The trans (T) and gauche