Experimental selection of molecules for isotope separation by multiple-photon dissociation in an intense IR field
Consideration is given to selectivity estimation methods during polyatomic molecules dissociation by multiple photon absorption. Taking the CH3NO2 molecule as an example, the possibilities of selectivity estimations made on the electron-excited dissociation products (luminescence) are shown, as well as on the measurements of the energy absorbed in a strong IR field being transformed into heat. Some advantages of the last method of the selectivity estimation are discussed. The experiments on nitrogen-isotopes separation in the mixture of CH3 14NO2 and CH3 15NO2 molecules are carried out when exciting thev 7 vibration with the isotope shift of about 7 cm−1 and thev 13 vibration with no isotope shift in the linear absorption spectrum. The contribution of secondary chemical reactions to the separation process is discussed.
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