Excited-state dynamics of Ru(tbbpy)+ investigated by femtosecond time-resolved four-wave mixing

✍ Scribed by B. Dietzek; D. Akimov; W. Kiefer; S. Rau; J. Popp; M. Schmitt

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 301 KB
• Volume: 4
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200610086

✦ Synopsis

Femtosecond time-resolved two-color four-wave mixing is employed to study the ultrafast excited-state relaxation processes in Ru(tbbpy) 2+

3 . The relaxation processes leading to a long-lived thermalized 3 MLCT-state are found to take place on two distinct time-scales. An ultrafast process, which is attributed to intersystem crossing, rapidly depopulating the initially photoexcited 1 MLCT-state, is found to take place in less than 200 fs. The second process visible in the experimental data occurs on a picosecond time-scale and is assigned to cooling within the 3 MLCT-state. Delay-time Probe-wavelength Spectrally resolved transient grating signal of Ru(tbbpy) 2+ 3 . Blue regions indicate low transient grating signal amplitudes, while red (white) ones mark high signal intensities.