Search for dissertations about: "rotational excitations"

Showing result 1 - 5 of 12 swedish dissertations containing the words rotational excitations.

2. 1. Quantum Scattering of Atoms and Molecules from Low-Index Copper Surfaces

   Author : Petter Linde; Göteborgs universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; surface; physisorption; potential; atoms; molecules; Debye-Waller factor; copper; diffraction; rotational excitations; resonances; semiclassical model; molecular beam; laser induced thermal desorption;

   Abstract : .... READ MORE

4. 2. Measurement and Application of Multidirectional Mobilities

   Author : Michael A. Sanderson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; source signal filtering; mass loading; rotational mobility; rotational inertia loading; multidirectional mechanical mobility; moment mobility; structural intensity; measurement techniques; vibration isolation;

   Abstract : The direct measurement of moment mobility, employing a twin exciter technique, is theoretically and experimentally examined. This is continued by a theoretical and experimental analysis of an improved technique using source signal filtering, for two degrees of freedom, for the measurement of multidirectional mobilities. READ MORE

5. 3. Collective Excitations in Transitional Nuclei Studied by Means of gamma-ray Spectroscopy and Lifetime Measurements

   Author : Hongjie Li; Bo Cederwall; Radomira Lozeva; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : Despite that it is more than 100 years since the atomic nucleus was first dis- covered by Ernest Rutherford and coworkers, many of its features still elude our understanding. The fact that the fundamental interactions between the nuclear constituents; nucleons, and ultimately quarks, are not yet known in detail, and the complexity of the nuclear many-body system compound the great challenges facing theoretical interpretations of experimental data. READ MORE

6. 4. Rotationally cold molecular ions in DESIREE : Threshold photodetachment thermometry of OH− and OD−

   Author : Gustav Eklund; Henning Schmidt; Roland Wester; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; fysik; Physics;

   Abstract : In experiments on molecular ions it is highly beneficial if the ions are in the electronic, vibrational and rotational ground state. Previous studies on these systems in ion traps or storage rings have been successful in preparing the molecular ions in the electronic and vibrational ground states, but the rotational degrees of freedom are experimentally more challenging due to their long relaxation times and the relatively small amounts of energy required for rotational excitations. READ MORE

7. 5. Precision molecular spectroscopy in the near- and mid-infrared using frequency comb-based Fourier transform spectrometers

   Author : Adrian Hjältén; Aleksandra Foltynowicz; Ove Axner; Adam Fleisher; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; optical frequency comb; molecular spectroscopy; Fourier transform spectrometer; high resolution; mid-infrared; line list; double-resonance spectroscopy; difference frequency generation; fysik; Physics;

   Abstract : Absorption spectroscopy is a powerful scientific tool for non-invasive and remote sensing applications ranging from atmospheric monitoring to astrophysics. In spectroscopic detection schemes it is necessary to have spectral models for any molecular species to be detected or quantified. READ MORE