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Show TABLE I. SI-S0 Origin Red Shifts for Chloronaphthalenes Compound Red shift from naphthalene (cm-1 )(a) 1 CN 2CN 1,2 DCN 1,4 DCN 1,5 DCN 1,8 DCN 2,3 DCN 2,7 DCN (a) Naphthalene origin at 312.21 nm (32,020 em-I). (b) From ref. 13. Figure Captions 436(b) 601 903 933 906 1327 1013 907 Fig. 1. Energy level diagram depicting excited and ionic states of a typical chlorinated aromatic (ArCI) and showing possible laser-based detection schemes with associated photophysical processes. Fig. 2. A schematic of the apparatus for molecular beam time-of-flight mass spectrometry (TOF MS) using resonantly enhanced multiphoton ionization (REMPI). Fig. 3. Molecular beam TOF mass spectra of jet-cooled 1,4 dichlorobenzene (DC B) taken with the nonnal TOF (upper panel) and the reflecb'On TOF (lower panel). Ionization is by 1+1 REMPI through the 274.10 nm band with -3 mJ pulse energy. Fig. 4. Reflectron TOF mass spectra for jet-cooled 1,4 DCB using 1+1 REMPI at 274.10 nm under varying photoionization conditions: Top panel - low UV pulse energy, Central panel - high UV pulse energy, and Bottom panel - high UV pulse energy plus dye laser fundamental at 548.20 nm. Fig. S. REMPI spectra of 1,4 DCB as a function of laser wavelength under several conditions: Top panel - one-color REMPI of a room temperature sample (-4xl0-6 torr), Central panel - one-color REMPI of a jet-cooled sample, and Bottom panel - two-color REMPI of a jet-cooled sample where A,2 is the fourth harmonic of the Nd:YAG laser at 266 nm. Only the parent ion, 12C6H4 35CI2+, is monitored with the TOF MS in the normal mode. Fig. 6. Two-color REMPI spectrum of a jet-cooled sample containing 1,2 and 1,4 DCB. The second color is 266 nm and only the parent ion is monitored. Fig. 7. Same as Fig. 6 but for a mixture of 1,2/1,4/1,8 dichloronaphthalenes (DCN). 19 |
