J. Phys. Chem. Lett., 2010, 1, 215-218

1. J. Phys. Chem. Lett., 2010, 1, 215-218

2. Introduction 3,5-dimethyl-4-(9-anthracenyl)julolidine Electron transfer (ET) processes and charge transfer (CT) states are involved in photosynthesis utilized in opto-electronic devices Electron donor acceptor (DA) molecules are useful for studying fundamental processes associated with electron transfer reactions CT states can be a mixture of locally excited (LE) and radical ion pair (RP; D•+-A•-) states Controlled by solvent polarity DMJ-An is an example Methyl groups inhibit rotation and simplify photophysics Femtosecond Stimulated Raman Spectroscopy (FSRS) to probe the extent of charge separation in the CT state. (DMJ) (An)

3. FSRS: Basic Principles Rev. Sci. Instrum., Vol. 75, No. 11, 2004, 4971-4980 Annu. Rev. Phys. Chem., 2007, 58, 461 – 88.

4. LASER system and Experimental Setup

5. FSRS: Advantages Annu. Rev. Phys. Chem., 2007, 58, 461 – 88.

6. FSRS: Fluorescence Rejection

7. DMJ-An: Electronic Spectroscopy 3,5-dimethyl-4-(9-anthracenyl)julolidine DMJ-An lex = 400 nm CT Sim An An•- DMJ•+ Room Temperature Spectra in THF, λex(TA) = 400 nm

8. * * * * * * * * * * * DMJ-An: FSRS Results FSRS Spectrum (λex = 400 nm,λRaman = 800 nm, Room Temperature, THF) Anthracene localized vibrations (*) Resonance enhancement Julolidine localized vibrations (*) Compare to 9-phenylanthracene (PA) PA contains localized An Vibrations DMJ-An CT excited state most closely resembles the PA•- radical anion

10. FSRS: Basic Principles Rev. Sci. Instrum., Vol. 75, No. 11, 2004, 4971-4980

13. Figure 1. Schematic layout of a grating-based compressor with negative dispersion, i.e. the short wavelengths (in blue) come out first. http://en.wikipedia.org/wiki/Chirped_pulse_amplification#With_gratings

14. Coherent Anti-stokes Raman Spectroscopy Increases the intensity of the anti-stokes transitions relative to spontaneous anit-stokes radiation

15. IR Vibrational Echo Experiments