High-resolution spectroscopy of He${}_2^{+}$ using Rydberg-series extrapolation and Zeeman-decelerated supersonic beams of metastable He${}_2$

Abstract

Recently, high-resolution spectroscopy of slow beams of metastable helium molecules (He${}_2^{\ast }$) generated by multistage Zeeman deceleration was used in combination with Rydberg-series extrapolation techniques to obtain the lowest rotational interval in the molecular helium ion at a precision of 18 MHz [Jansen et al. Phys. Rev. Lett. 115 (13) (2015) 133202], limited by the temporal width of the Fourier-transform-limited laser pulses used to record the spectra. We present here an extension of these measurements in which we have (1) measured higher rotational intervals of He${{}_2}^{+}$, (2) replaced the pulsed UV laser by a cw UV laser and improved the resolution of the spectra by a factor of more than five, and (3) studied $M_J$ redistribution processes in regions of low magnetic fields of the Zeeman decelerator and shown how these processes can be exploited to assign transitions originating from specific spin-rotational levels ($N^{\prime \prime },J^{\prime \prime }$) of He${}_2^{\ast }$.

arXiv comment28 pages, 8 figures

References in corpus (5)

• Relativistic corrections of mα^6 order to the ro-vibrational spectrum of H_2^+ and HD^+ molecular ions
• Theoretical transition frequencies beyond 0.1 ppb accuracy in H${}_2^{+}$, HD${}^{+}$, and antiprotonic helium
• Precision measurement of the ionization energy of Cs I
• Slow and velocity-tunable beams of metastable He${}_2$ by multistage Zeeman deceleration
• Multistage Zeeman deceleration of metastable neon

Cited by in corpus (8)

• Non-adiabatic, Relativistic, and Leading-order QED Corrections for Rovibrational Intervals of ${}^4$He${}_2^{+}$ ($X{}^2{\Sigma }_{\mathrm{u}}^{+}$)
• Design and construction of a multistage Zeeman decelerator for crossed molecular beams scattering experiments
• Multistage Zeeman deceleration of NH $X{}^3{\Sigma }^{-}$ radicals
• Multistage Zeeman deceleration of atomic and molecular oxygen
• Precision measurement of the rotational energy-level structure of the three-electron molecule He${}_2^{+}$
• Characterization of the electronic ground state of He${}_2^{+}$ by high-resolution photoelectron spectroscopy
• High-Precision Quantum Dynamics of He${}_2$ over the b ${}^3{\Pi }_{\mathrm{g}}$-c ${}^3{\Sigma }_{\mathrm{g}}^{+}$ Electronic Subspace by including Non-adiabatic, Relativistic and QED Corrections and Couplings
• Rovibrational computations for He${}_2^{+}$ X ${\Sigma }_{\mathrm{u}}^{+}$ including non-adiabatic, relativistic and QED corrections