Ultrafast excited state population relaxation in femtosecond four-wave mixing experiments

2005 ◽  
Author(s):  
A.J. Boeglin ◽  
J.P. Lavoine ◽  
P. Martin ◽  
A.A. Villaeys
Keyword(s):  
Excited State ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
State Population ◽  
Population Relaxation ◽  
Excited State Population

Excited state dynamics in phthalocyanines studied using degenerate four wave mixing with incoherent light

2002 ◽  
Vol 06 (03) ◽  
pp. 233-237 ◽  
Author(s):  
S. Venugopal Rao ◽  
D. Narayana Rao
Keyword(s):  
Excited State ◽  
Relaxation Times ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Phase Relaxation ◽  
Incoherent Light ◽  
Phase Conjugate ◽  
Excited State Dynamics ◽  
Degenerate Four Wave Mixing ◽  
Population Relaxation

We present our experimental results on the measurements of excited state dynamics in phthalocyanines ( Pc , CuPc , FePc , and ZnPc ) using degenerate four wave mixing with incoherent light (DFWM-IL). Three different timescales were observed, for all samples, in the phase conjugate signal recorded as a function of delay in probe beam in the standard backward geometry. The fastest component (< 170 fs) is associated to the phase relaxation in the S n states and the slowest components (∼3-5 ps and 35-55 ps) to the vibration and population relaxation times from the S1 state. The present results are compared with those obtained with shorter pulses and various techniques for similar molecules. The consequences of such short lifetimes are also discussed in view of the strong optical limiting properties of these molecules.

Experimental setups for FEL-based four-wave mixing experiments at FERMI

2016 ◽  
Vol 23 (1) ◽  
pp. 132-140 ◽  
Author(s):  
Filippo Bencivenga ◽  
Marco Zangrando ◽  
Cristian Svetina ◽  
Alessandro Abrami ◽  
Andrea Battistoni ◽  
...  
Keyword(s):  
Excited State ◽  
Inelastic Scattering ◽  
Free Electron ◽  
Free Electron Laser ◽  
Scientific Community ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Experimental Facilities ◽  
Near Future ◽  
Experimental Strategies

The recent advent of free-electron laser (FEL) sources is driving the scientific community to extend table-top laser research to shorter wavelengths adding elemental selectivity and chemical state specificity. Both a compact setup (mini-TIMER) and a separate instrument (EIS-TIMER) dedicated to four-wave-mixing (FWM) experiments has been designed and constructed, to be operated as a branch of the Elastic and Inelastic Scattering beamline: EIS. The FWM experiments that are planned at EIS-TIMER are based on the transient grating approach, where two crossed FEL pulses create a controlled modulation of the sample excitations while a third time-delayed pulse is used to monitor the dynamics of the excited state. This manuscript describes such experimental facilities, showing the preliminary results of the commissioning of the EIS-TIMER beamline, and discusses original experimental strategies being developed to study the dynamics of matter at the fs–nm time–length scales. In the near future such experimental tools will allow more sophisticated FEL-based FWM applications, that also include the use of multiple and multi-color FEL pulses.

Excited-state population distributions of alkaline-earth metal in a hollow cathode lamp

2018 ◽  
Vol 16 (3) ◽  
pp. 033001
Author(s):  
Pengyuan Chang Pengyuan Chang ◽  
Bo Pang Bo Pang ◽  
Yisheng Wu Yisheng Wu ◽  
Jingbiao Chen Jingbiao Chen
Keyword(s):  
Excited State ◽  
Hollow Cathode ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Hollow Cathode Lamp ◽  
State Population ◽  
Population Distributions ◽  
Excited State Population

New test of the excited state population method for measurements of nuclear temperatures

1990 ◽  
Vol 41 (5) ◽  
pp. 2406-2409 ◽  
Author(s):  
J. H. Lee ◽  
W. Benenson ◽  
C. Bloch ◽  
Y. Chen ◽  
R. J. Radtke ◽  
...  
Keyword(s):  
Excited State ◽  
State Population ◽  
Excited State Population

Measurement of the chirp-dependent fluorescence response: a window to excited-state population dynamics

1999 ◽  
Author(s):  
G. J. Brakenhoff ◽  
Arjan H. Buist ◽  
Michiel Mueller ◽  
Jeffrey A. Squier ◽  
Chris J. Bardeen ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Excited State ◽  
Fluorescence Response ◽  
State Population ◽  
Excited State Population
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