Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 181 for “"Pump-Probe"”.
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Picosecond pump-probe diagnostics for combustion
Includes bibliographical references (pages 181-191).
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Directional Dependence and Polarization Anisotropy in Pump-probe Microscopy
… medical imaging. Among the imaging modalities, pump-probe microscopy is a versatile technique that shows great potential to image melanomas (a skin cancer) for which there is still a great need for improved early clinical diagnosis. But image analysis often suffers from an incomplete …
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Photoinduced dynamics studied by ultrafast single-shot pump-probe spectroscopy
… amplifier to provide tunable sources for pump-probe spectroscopy. Next, the experimental setup of dual-echelon single-shot spectroscopy is illustrated with great detail and possible noise sources and correction methods are explored. Using the single- shot technique, we studied photoinduced …
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Femtosecond pump-probe spectroscopy of chemical reactions in liquids and crystals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1998.
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Wide-field structured illumination microscopy for fluorescence and pump-probe imaging
… to surface plasmon resonance fluorescence and pump-probe scattering imaging. First, structured illumination microscopy was introduced to surface plasmon resonance fluorescence imaging for high signal-to-noise and high resolution. Secondly, a theoretical framework for three-dimensional …
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Studying Ultrafast Vibrational dynamics of Intramolecular Hydrogen Bonds using Broadband Infrared Pump-Probe Spectroscopy.
… presents work done by using ultrafast Infrared pump-probe spectroscopy to study the vibrational dynamics of two intramolecular hydrogen bonded complexes, 10-Hydroxybenzo[h]quinolone (HBQ) and 2-(2′-Hydroxyphenyl)benzothiazole (HBT) dissolved in carbon tetrachloride. One of the biggest difficulty …
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Chlorine dioxide photochemistry in solution: time-resolved resonance Raman and femtosecond pump-probe studies
… resonance Raman (TRRR) and femtosecond pump-probe (FPP) spectroscopy. OClO photochemistry is investigated in a variety of solvents in order to ascertain the influence of environment on the photoreactivity of this compound. Specifically, the effect of solvent on dynamics associated with …
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Investigation of carrier dynamics in InN, InGaN, and GaAsBi by optical pump-probe techniques /
The thesis is dedicated to investigation of carrier dynamics in InN, InGaN, and GaAsBi heterostructures by using light-induced transient gratings and differential transmission techniques. The experimental studies in a wide range of excess carrier densities and temperatures revealed that …
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Signal processing studies of detector systems for use in single-point pump/probe absorption spectroscopy
Includes bibliographical references (pages 111-113).
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Applications of Pump-Probe and Two-Photon Techniques in Time-Resolved Fluorescence Microscopy and Spectroscopy
… to time-resolved polarization imaging of probe molecules inside STO cells are shown. Depending on the type of probe molecules and the nature of their interaction with cellular constituents, different degrees of rotational correlation times are obtained.
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Applications of pump-probe and two-photon techniques in time-resolved fluorescence miscroscopy and spectroscopy
Pump-probe spectroscopy has long been useful in the elucidating ultrafast molecular phenomena. We developed a variation of time-resolved, pump-probe methodology using cross-correlation principles of the frequency-domain. An unique feature of our technique is that the low-frequency, cross …
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Surface acoustic wave techniques in laser pump-probe systems and its applications in studying mechanical properties of materials
… acoustic wave (SAW) techniques in optical pump-probe system, and apply them to measure shear elastic constants of thin films and damping of high frequency shear acoustic waves. While longitudinal elastic constants of thin films can be measured conveniently in optical pump-probe system, …
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Decoupling bulk- and surface-limited lifetimes in thin kerfless silicon wafers using spectrally resolved transient absorption pump-probe spectroscopy and computer simulations
… Herein, spectrally resolved transient absorption pump-probe spectroscopy and extensive Technology Computer Aided Design simulations are used to decouple the bulk- and surface-limited lifetimes of thin kerfless silicon wafers in a single measurement. A range of sample conditions are studied. It is …
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Femtosecond time-resolved photoelectron spectroscopy in the extreme ultraviolet region
Eine experimentelle Apparatur für Femtosekunden Pump-Probe-Studien reversibler Prozesse im EUV Bereich wurde aufgebaut. Photoelektronenspektren von Einzelkristallen, Adsorbaten und Gasen wurden gemessen. Die zeitaufgelösten Photoelektronenspektren des Pt(110) Valenzbandes zeigen die ultraschnelle …
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Quantenmechanische Modellierung der Photodynamik und Femtosekunden-Spektroskopie komplexer molekularer Systeme
… Simulationen der zeitaufgeloesten <br>Pump-Probe-Spektren und der cw-Spektren werden durchgefuehrt und mit <br>experimentellen Messungen verglichen. <br> <br>Darueber hinaus werden Weiterentwicklungen numerischer Methoden zur <br>effizienten Berechnung zeitaufgeloester Spektren …
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Dissociation dynamics of diatomic molecules in intense fields
… release (KER) spectra as a function of the pump-probe delay τ. Lastly, the electron localization is studied for long circularly polarized laser pulses. Chapter 5 covers the dissociation dynamics of O[subscript]2[superscript]+ in an IR laser field. The fragment KER spectra are analyzed as a …
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Apertureless Scanning Nearfield Optical Microscopy with Ultra-high Temporal Resolution
… nearfield optical microscope (aSNOM) with a pump probe scheme, we create a novel experimental tool called pump probe apertureless scanning near field optical microscope (ppaSNOM), that combines a temporal resolution of 1ps with a spatial resolution of 20nm. This alloptical technique far below …
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Coherent optical nonlinearities in semiconductor microstructures
… structures is investigated by means of pump-probe spectroscopy. For nonresonant excitation below the excitonic transition the direction of the shift of the resonance depends on the polarization of the pump and probe pulses. In particular, for anti-circular polarization a surprising …
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Multiscale Insights into Molecular Interfaces: STM Imaging and Ultrafast Laser-Induced Dynamics
… to dynamic processes, a home-built optical pump-probe STM (OPP-STM) platform utilizing femtosecond lasers was developed and validated. Systematic time-zero calibration and pump-probe experiments, including studies on coproporphyrin I dihydrochloride (CID), confirm the system’s temporal …
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Study of Wavepacket Dynamics in Rubidium Vapor by Means of Time-Frequency Analysis
… atomic wavepackets are optically detected via a pump-probe experiment based on axially phase-matched parametric four-wave mixing (FWM). This nonlinear process results in coherent ultraviolet (UV) or violet emission that carries information about the relative number densities of the excited …
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