Abstract
Isotopically selective (with respect to 18O) one- and two-frequency multiphoton dissociation of dimethyl ether (CH3)2O by pulsed TEA CO2 laser radiation has been studied. The maximum primary selectivity, α℞16, is attained with the dissociation yields of the desired component (CH3) 2 18 O β18=5×10−4 and 1.7×10−2 for one- and two-frequency excitation, respectively. The dependences of MPD yields and selectivity on laser radiation frequency, (CH3)2O pressure, buffer gas (N2) pressure and temperature have been measured. Multiphoton absorption coefficients have been measured and the average number of absorbed quanta calculated. The laser photon energy consumed for separating one 18O atom has been estimated: 11 and ∼4 keV/18O atom for one- and two-frequency excitation, respectively.
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