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 Title: Measurements Of Np-2s Transitions In The Hydrogen Atom Author(s): Scheidegger, Simon Contributor(s): Merkt, Frédéric; Schmutz, Hansjürg; Agner, Josef A. Subject(s): Mini-symposium: Precision Spectroscopy for Fundamental Physics Abstract: Precision experiments in the hydrogen atom have a long tradition and extensive studies of transitions between low lying $n\leq12$ states were carried out \footnote{J. C. Garreau \textit{et al.}, J. Phys. France \textbf{51}, 2293 (1990).}\footnote{C. G. Parthey \textit{et al.}, Phys. Rev. Lett. \textbf{107}, 203001 (2011)} \footnote{A. Beyer \textit{et al.}, Science \textbf{358}, 79 (2017)} \footnote{H. Fleurbaey \textit{et al.}, Phys. Rev. Lett. \textbf{120}, 183001 (2018)} \footnote{N. Bezginov \textit{et al.}, Science \textbf{365}, 1007 (2019)}\footnote{A. Grinin \textit{et al.}, Science \textbf{370}, 1061 (2020)}. These measurements can be used to determine values of the Rydberg constant and the proton charge radius. We present a new experimental approach to perform measurements of transition frequencies between the metastable 2s $^{2}S_{1/2} (F = 0,1)$ state of H and highly excited Rydberg states with principal quantum number $n \geq 23$.\\ We generate the hydrogen atoms by photodissociation of NH$_3$ in a capillary mounted at the orifice of a pulsed valve. The hydrogen atoms are entrained in supersonic expansions of a rare gas. The atoms enter a magnetically shielded region in which they are photoexcited to a specific hyperfine level of the metastable 2s $^{2}S_{1/2}$ state by a home-built frequency-tripled Fourier-transform-limited pulsed titanium sapphire laser (pulse length 40\,ns). Transitions to $n$p Rydberg states are then induced by a narrow-band frequency-doubled continuous-wave titanium sapphire laser, which is phase locked to an optically stabilized frequency comb and referenced to a Cs primary frequency standard. The highly excited Rydberg states are detected by pulsed-field ionization. We will report progress on our efforts to minimize uncertainties from stray electric fields and Doppler shifts and to obtain spectral lines with a FWHM below 10\,MHz.\\ Issue Date: 2021-06-23 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111346 DOI: 10.15278/isms.2021.WI02 Date Available in IDEALS: 2021-09-242022-01-21
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