Dear all,
Here I noticed a peak signal of CO2 in Raman spectrum after increasing accumulation time, between the two peaks of 1280 cm-1 and 1380 cm-1, (as shown in the attached figure) which are used in densimeters commonly.
After I increased the accumulation time of spectrum collection, one curve signal (located about 1330 cm-1, the Q peak in attached figure) appeared between the two main peaks of CO2, its intensity is so weak that we can not notice it in normal CO2 spectra collection. I am wondering the vibrational mode and the cooresponding atoms (12C, 13C, 16O or 18O) of the signal. I searched several times from literatures but no much result, G. IRMER (2002) mentioned it in a short paper but still marked it as "Q", no more explaination. Here I am looking forward to get your answer for this question which makes me confused.
Wenjing
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