“…Experimental structural data were found in the literature for phosphine, 6,7 methylphosphine, 8,10,11 dimethylphosphine, 8,12 trimethylphosphine, 9,13À15 ethylphosphine, 16,17 isopropylphosphine, 18,19 ethyldimethylphosphine, 20,21 and tert-butylphosphine. 22,23 The molecular structures were determined from either electron diffraction or microwave spectroscopy, while almost all of their vibrational frequencies are available from infrared, Raman, or microwave spectroscopy.…”