Transmittance/% 100 50- A B 3000 2500 2000 1500 1000 500 Wavenumbers //cm Figure 2. IR spectrum of C3H5N 2'6 2'4 1'8 1'6 12 o's 0.4 o'2 ppm Figure 3. 'H NMR spectrum of C3H5N recorded in CDCI3

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.