|Budget Amount *help
¥5,000,000 (Direct Cost : ¥5,000,000)
Fiscal Year 1993 : ¥600,000 (Direct Cost : ¥600,000)
Fiscal Year 1992 : ¥600,000 (Direct Cost : ¥600,000)
Fiscal Year 1991 : ¥3,800,000 (Direct Cost : ¥3,800,000)
Spectroscopic study has been perfomed for the detection of non-fluo-rescent radicals, in order to clarify the reaction dynamics of rare-gas metastables with molecules. Discharge sources for generation of rare-gas metastables and the reaction chamber were differentially pumped. The radicals produced by the reactions were ionized via resonant enhanced multiphoton ionization (REMPI) and were detected by the time-of-flight mass spectrometer (Reflectron). Exicimer laser (XeCl) pumped dye laser was used for REMPI.Two types of discharge sources, a holow cathode discharge and pulsed discharge were used. The first experiments were carried out by using the former discharge souurce. REMPI spectra of benzene, tropolone and water molecules were measured for examining the sensitivity of the apparatus. We have attempted to observe (2+1) and (3+1) REMPI spectra of CH_2 and CH_2 radicals which are produced from reactions (1) and (2), respectively, Ar(^3P_<2,0>)+CH_4->CH_3+H+Ar (1) ->CH_2+H_2(2H)+Ar (2). However, we did not succeed in observing REMPI spectra. Then, we have changed the discharge source to the pulsed type. Argon metastable atoms were produced in higher concentration compared with the hollow cathode discharge source. Measurement of REMPI spectra of CCl radical was carried out for reaction of Ar(^3P_<2,0>) with CCl_4. We have tried to enhance the sensitivity of the new apparatus.
Furthermore, we detetermined the cross sections for the formation of diatomic radcals in their clectronic ground states which were produced from the reactions of Ar(^3P_<2.0>) with CH_4, halomethanes and silanes.