The vibration-rotation Raman spectrum of the v2 fundamental band of P4 has been recorded photographically using a spectrograph with a reciprocal linear dispersion of 1.36 cm-' rnrn-l. Analysis of the spectrum gave the following values for the vibration and rotation constants and the P-P bond length:.813 f 0.004 cm-'; IO4cy2 = -1.35 f 0.09 cm-'; io = 222.28 f 0.05 pm.
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