A STUDY OF THE RAMAN NON-COINCIDENCE EFFECT FROM METHYL FORMATE METHYL D-FORMATE SOLUTIONS

The Raman Non-Coincidence Effect (NCE) of the carbonyl stretching band of methyl formate as a pure liquid and diluted in methyl d-formate ha s been studied. A theoretical model of the behaviour of the NCE with i sotopic dilution has been proposed by Logan (1). Logan's model was tes ted and found to agree with the experimental data. The bandwidths of t he carbonyl band were also measured. The variation with concentration was unexpected (first increasing and then decreasing). This suggests e ither a change in the total amount of intermolecular coupling or that resonant energy transfer and pure vibrational dephasing an statistical ly correlated.