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.
Results
Showing 1 to 8 of 8 for “"ionization threshold"”.
-
The Cryogenic Dark Matter Search low ionization-threshold experiment
… technology. “CDMSlite” stands for CDMS - low ionization threshold experiment. Here we utilize a unique electron phonon coupling mechanism to measure ionization generated by scattering of light particles. Typically signals from such low energy recoils would be washed under instrumental noise. …
-
Experimental Investigation of Long-Lived "ZEKE" Rydberg States in Ultracold Argon
… an energy region near (both above and below) an ionization threshold. Excitation to bound, highly-excited Rydberg states can lead to formation of a plasma via several processes, including collisions between Rydberg atoms. Three-body recombination in an ultracold plasma can also result in the …
-
The design and performance of an x-ray emission spectrometer using the polarized Kalpha spectra of chlorine and potassium
… and a large effect seen in potassium below the ionization threshold. There were also small effects seen in freon-13 when excitations were to Rydberg states.
-
Construction and calibration of a custom time-of-flight mass spectrometer and its use in measuring the reaction kinetics of transition metal ion-organic interactions.
… combined with time of flight spectroscopy. Ionization occurs in a large main chamber. The ions are separated via a kinetic energy pulse from a custom built linear particle accelerator. The revelatory hardware for our instrument is a microchannel plate detector (MCP). The MCP is mounted on …
-
Estudo fotodinâmicos por espectroscopia laser e radiação síncrotron: de pequenos hidrocarbonetos aos polímeros
… The second, measurements of absolute photoionization cross section, with results on: the methyl radical (CH3), the atomic iodine (2P3/2) and iodomethane or methyl iodide (CH3I). To achieve this, the combination of experiments based on synchrotron radiation and VUV laser with the use of …
-
One-dimensional hydrogen atom
The photoionization spectrum of highly excited hydrogen atoms in the energy range between E = 0 and E = Ec ionization thresholds is examined in the presence of a strong de electric field. Atomic hydrogen is excited from the ground state via a three-photon process to high-lying excited states. …
-
Improved mass spectrometry characterization of organic compounds using analyte preconcentration and radio-frequency ionization.
… of efficient sampling techniques and versatile ionization sources. Presented research projects focus on the use of analyte preconcentration and radio-frequency ionization to improve sensitive characterization of organic compounds with MS. A home-built post-column cryogenic trap (PCCT) coupled to …
-
Photoionization of atoms with ultrashort XUV laser pulses at extreme intensities
The present thesis is concerned with the photoionization dynamics of atoms exposed to high intense and ultrashort XUV-laser pulses of free-electron lasers. In particular, the influence of coherent dynamics of the electrons as well as the electron-electron interaction are in focus of this survey and …