scholarly journals Ti:sapphire-based ultrafast pump-probe laser source in the violet and ultraviolet

1994 ◽  
Author(s):  
George Rodriguez ◽  
Jeffrey P. Roberts ◽  
Antoinette J. Taylor
Keyword(s):  
Laser Source ◽  
Probe Laser ◽  
Pump Probe

Pump-Probe Laser Photolytic Fragmentation Fluorescence Spectrometry of Isomeric Alkenes

1994 ◽  
Vol 48 (5) ◽  
pp. 616-619 ◽  
Author(s):  
Bobby J. Stanton ◽  
E. T. Monroe ◽  
E. L. Wehry
Keyword(s):  
Fluorescence Intensity ◽  
Laser Fluence ◽  
Laser Wavelength ◽  
Fluorescence Spectrometry ◽  
Probe Laser ◽  
Intermediate Species ◽  
Pump Probe ◽  
Laser Pump ◽  
Photolysis Laser ◽  
Spectral Patterns

The two-laser “pump-probe” photolytic fragmentation fluorescence spectrometry of three octenes and two nonenes is described. Probe-laser-induced C2 fluorescence (Deslandres-d'Azambuja system, C1II g→ A1II u) is detected. The relative C2 fluorescence intensity and spectral patterns exhibited by each alkene are strongly dependent on the probe-laser wavelength. The dependence of the fragment fluorescence intensity on the probe-laser fluence implies that the “probe” laser induces photofragmentation of intermediate species produced by the “photolysis” laser.

Electron emission from films of Ag and Au nanoparticles excited by a femtosecond pump-probe laser

2008 ◽  
Vol 77 (19) ◽  
Author(s):  
A. Gloskovskii ◽  
D. A. Valdaitsev ◽  
M. Cinchetti ◽  
S. A. Nepijko ◽  
J. Lange ◽  
...  
Keyword(s):  
Electron Emission ◽  
Au Nanoparticles ◽  
Probe Laser ◽  
Pump Probe

On the Doppler averaging of susceptibility in pump-probe laser spectroscopy

2015 ◽  
Vol 22 (4) ◽  
pp. 521-525 ◽  
Author(s):  
Gyeong-Won Choi ◽  
Heung-Ryoul Noh
Keyword(s):  
Laser Spectroscopy ◽  
Probe Laser ◽  
Pump Probe

Rotational assignments in the S1 (1B3u) state of pyrazine by UV – UV pump-probe laser spectroscopy

1991 ◽  
Vol 177 (4-5) ◽  
pp. 357-360 ◽  
Author(s):  
Paul Uijt de Haag ◽  
Johannes Heinze ◽  
W. Leo Meerts
Keyword(s):  
Laser Spectroscopy ◽  
Probe Laser ◽  
Pump Probe

scholarly journals A multi-MHz single-shot data acquisition scheme with high dynamic range: pump–probe X-ray experiments at synchrotrons

2016 ◽  
Vol 23 (6) ◽  
pp. 1409-1423 ◽  
Author(s):  
Alexander Britz ◽  
Tadesse A. Assefa ◽  
Andreas Galler ◽  
Wojciech Gawelda ◽  
Michael Diez ◽  
...  
Keyword(s):  
Data Acquisition ◽  
Dynamic Range ◽  
Avalanche Photodiode ◽  
Fluorescence Yield ◽  
Laser Source ◽  
Single Shot ◽  
Pump Probe ◽  
X Ray ◽  
Acquisition Scheme ◽  
Data Point

The technical implementation of a multi-MHz data acquisition scheme for laser–X-ray pump–probe experiments with pulse limited temporal resolution (100 ps) is presented. Such techniques are very attractive to benefit from the high-repetition rates of X-ray pulses delivered from advanced synchrotron radiation sources. Exploiting a synchronized 3.9 MHz laser excitation source, experiments in 60-bunch mode (7.8 MHz) at beamline P01 of the PETRA III storage ring are performed. Hereby molecular systems in liquid solutions are excited by the pulsed laser source and the total X-ray fluorescence yield (TFY) from the sample is recorded using silicon avalanche photodiode detectors (APDs). The subsequent digitizer card samples the APD signal traces in 0.5 ns steps with 12-bit resolution. These traces are then processed to deliver an integrated value for each recorded single X-ray pulse intensity and sorted into bins according to whether the laser excited the sample or not. For each subgroup the recorded single-shot values are averaged over ∼107 pulses to deliver a mean TFY value with its standard error for each data point,e.g.at a given X-ray probe energy. The sensitivity reaches down to the shot-noise limit, and signal-to-noise ratios approaching 1000 are achievable in only a few seconds collection time per data point. The dynamic range covers 100 photons pulse−1and is only technically limited by the utilized APD.

Sign in / Sign up

Export Citation Format

Share Document