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\title{HIGH-RESOLUTION SPECTROSCOPY AND MULTICHANNEL QUANTUM-DEFECT-THEORY\\
ANALYSIS OF HIGH RYDBERG STATES OF XENON }

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\author{\underline{\FirstName E.~N. \LastName TOUTOUDAKI}, {\FirstName H. \LastName HERBURGER}, {\FirstName U. \LastName HOLLENSTEIN}, {\FirstName F. \LastName MERKT}}
\address{Department of Chemistry and Applied Biosciences, ETH Z\"{u}rich, 8093 Z\"{u}rich, Switzerland}

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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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High-resolution spectra of high {\it n}p and {\it n}f Rydberg states of Xe were measured by single-photon excitation from the metastable state of Xe (5p)${^5}$(6s)${^1}$ ${^3}$P${_2}$ to the energy region located below the Xe${^+}$(5p)${^5}$ ${^2}$P${_{3/2}}$ ionization threshold.The experiments were carried out using a pulsed Fourier-transform-limited narrow-band UV laser and a supersonic-beam apparatus.

The fine and hyperfine structures of {\it n}p and {\it n}f Rydberg states of the nine most abundant isotopes of xenon have been analyzed in the range of the principal quantum number between 60 and 75 using multichannel quantum-defect-theory (MQDT). For the analysis of the fine structure of xenon, the formalism introduced by Lu and Lee [1] and Lu [2] was followed. This formalism was extended by W\"{o}rner et al. [3,4] and Sch\"{a}fer et al. [5] to treat the hyperfine structure in Rydberg states of ${^{129}}$Xe and  ${^{131}}$Xe. By using the eigenquantum defects and channel interaction parameters for the even-parity states of xenon from Sch\"{a}fer et al.[5], improved values of the ionization energies and the isotopic shifts have been determined from the MQDT analysis.\newline
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[1] C. M. Lee and K. T. Lu, Phys. Rev. A, 1973, 8, 1241.\newline
[2] K. T. Lu, Phys. Rev. A, 1971, 4, 579.\newline
[3] H. J. W\"{o}rner, U. Hollenstein, and F. Merkt, Phys. Rev A, 2003 , 68, 032510.\newline
[4] H. J. W\"{o}rner, M. Gr\"{u}tter, E. Vliegen, and F. Merkt, Phys. rev. A, 2005 , 71, 052504; 2006 , 73, 059904(E).\newline
[5] M. Sch\"{a}fer, M. Raunhardt, and F. Merkt, Phys. Rev. A, 2010, 81, 032514.
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