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 9 of 9 for “"photo-ionization"”.
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Two-Photon Ionization of the Calcium 4S3D 1D2 Level in an Optical Dipole Trap
… in the 4s3d 1D2 state. The 488 nm light also photo-ionizes the trapped atoms due to a near-resonant transition to the 4s4f 1F3 level. These ions leave the trap and are detected to determine the trap decay rate. By measuring this decay rate as a function of 488 nm intensity, we determine the …
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Development of a quadrupole ion trap / time-of-flight mass spectrometer for mass resolution and ion photophysics
… is described for ion mass resolution and photophysics. Ions are generated externally by electrospray ionization and trapped in the quadrupole ion trap before extraction to the time-of-flight section for mass analysis. The non-parallel fields in the hyperbolic ion trap, which serves as the …
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Resonance Two Photon Ionization Study of Binary Clusters of Styrene with Polar Molecules
One-color resonance two-photo ionization (R2PI) spectra of mixed clusters of styrene molecule (S) with polar molecules [water (W), methanol (M), ethanol (E), and trifuoroethanol (T)] were measured through the S1←S0 transition of the styrene molecule. The spectra reveal a rapid increase in …
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Schwerebeschleunigungen Kühler Sterne
… of spectroscopic stellar gravities “g” via the ionization equilibrium constraint. The respective influence of various model assumptions (atomic data sets including photo-ionization cross-sections and transition probabilities; the efficiency of collisions with neutral particles and so forth) is …
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Nanostructures for Coherent Light Sources and Photodetectors
… lack of efficient light sources and broadband photodetectors, which could be integrated with the silicon complementary metal-oxide-semiconductor (CMOS) technology. Persistent efforts continue to achieve efficient light emission as well as broadband photodetection from silicon in extending the …
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The mid-latitude ionosphere under quiet geomagnetic conditions: propagation analysis of SuperDARN radar observations from large ionospheric perturbations
… an anomaly in the standard ionospheric model of photo-ionization and recombination. This type of event provides an ideal candidate for testing the ray-tracing model and analyzing propagation effects in SuperDARN observations. The anomaly was first observed in ground backscatter occurring around …
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Measurement of soot precursor particles under atmospheric and low pressure conditions by means of time-of-flight mass spectrometry
… the generation of an optimized molecular beam. Photo ionization of the sample is provided by an excimer laser. The main findings of this work can be summarized as follows: 1. Different types of soot precursor particles can coexist in the flame. For the first time two different types of soot …
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Influence of Aerosols During Amine-Based CO2 Capture: Evolution and Control
… factors. Introducing a pre-charging stage and a photo-ionization stage into an ESP has shown potential in increasing particle charging and capture efficiency, but has not been evaluated in bench-scale or realistic power plant conditions. Therefore, the dissertation addresses the aforementioned …
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Rare-gas clusters in intense VUV laser fields
… between the quantum, rate based description of photon absorption by bound electrons and the classical, deterministic description of the cluster nano-plasma. Typical observables such as total energy absorption, electron and ion spectra are in very good agreement with the experimental findings. A …