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Development of an experiment for trapping, cooling, and spectroscopy of molecular hydrogen ions

Development of an experiment for trapping, cooling, and spectroscopy of molecular hydrogen ions

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SCHNITZLER, Harald, 2001. Development of an experiment for trapping, cooling, and spectroscopy of molecular hydrogen ions

@phdthesis{Schnitzler2001Devel-9199, title={Development of an experiment for trapping, cooling, and spectroscopy of molecular hydrogen ions}, year={2001}, author={Schnitzler, Harald}, address={Konstanz}, school={Universität Konstanz} }

Development of an experiment for trapping, cooling, and spectroscopy of molecular hydrogen ions Entwicklung eines Experiments zur Speicherung, Kühlung und Spektroskopie von molekularen Wasserstoffionen deposit-license Schnitzler, Harald 2011-03-24T17:54:29Z An experiment aimed at high-resolution spectroscopy of the rotational vibrational level<br />structure of cold hydrogen molecular ions, HD$^+$, is presented.<br /><br />The molecular hydrogen ion, HD$^+$, as one of the simplest molecules, is outstandingly<br />suitable for theoretical calculations which shall be compared to experimental data. It<br />allows direct spectroscopic tests of quantum-electrodynamics and relativistic corrections<br />in molecules. Furthermore, once theory and experiment both achieve an accuracy better<br />than $2cdot 10^{-9}$ the spectroscopic values of the ro-vibrational transition<br />frequencies of HD$^+$ can be used to obtain a more accurate value of the fundamental<br />constant $m_e / m_p$. In addition if a very high stability of the HD$^+$ transition<br />frequencies can be achieved, improved tests of the time invariance of $m_e / m_p$ could<br />be performed.<br /><br />The HD$^+$ molecular ions will be confined in a linear rf Paul trap and sympathetically<br />cooled by interaction with laser cooled Be$^+$ stored in the same trap. The linear rf<br />Paul trap has the main advantage not to require any magnetic field, which could be a<br />problem for high resolution spectroscopy. A linear trap is used instead of a classical<br />hyperbolic shaped, because this configuration provides more trapped molecular ions in the<br />free-field region at less second order Doppler shift.<br /><br />The molecules are cooled sympathetically by Beryllium ions. The laser cooling light at $313;$nm is produced in a new setup of doubly resonant<br />sum-frequency generation (DR-SFG) in LBO. UV radiation of $> 2,$mW<br />output power around $313,$nm is generated. A coarse tuning range of 6,nm, a continuous<br />tunability of $> 15$,GHz (which is required for fast and efficient cooling of the<br />initially hot ions), a sub-MHz linewidth, a frequency drift below 20,MHz/h, and stable<br />long-term operation is obtained. The theory of optimized doubly-resonant SFG is also<br />given. application/pdf 2011-03-24T17:54:29Z 2001 Schnitzler, Harald eng

Dateiabrufe seit 01.10.2014 (Informationen über die Zugriffsstatistik)

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