Fourier-transform spectroscopy of Sr2 and revised ground state potential

Abstract

Precise potentials for the ground state X1Sigma+g and the minimum region of the excited state 2_1Sigma+u of Sr2 are derived by high resolution Fourier-transform spectroscopy of fluorescence progressions from single frequency laser excitation of Sr2 produced in a heat pipe at 950 Celsius. A change of the rotational assignment by four units compared to an earlier work (G. Gerber, R. Möller, and H. Schneider, J. Chem. Phys. 81, 1538 (1984)) is needed for a consistent description leading to a significant shift of the potentials towards longer inter atomic distances. The huge amount of ground state data derived for the three different isotopomers 88Sr2, 86Sr88Sr and 87Sr88Sr (almost 60% of all excisting bound rovibrational ground state levels for the isotopomer 88Sr2) fixes this assignment undoubtedly. The presented ground state potential is derived from the observed transitions for the radial region from 4 to 11 A (9 cm-1 below the asymptote) and is extended to the longe range region by the use of theoretical dispersion coefficients together with already available photoassociation data. New estimations of the scattering lengths for the complete set of isotopic combinations are derived by mass scaling with the derived potential. The data set for the excited state 2_1Sigma+u was sufficient to derive a potential energy curve around the minimum.

10 pages, 7 figures, some small corrections done especially to the potential description of the excited state (already included in the published journal version)

References in corpus (11)

• Sr lattice clock at 1x10^{-16} fractional uncertainty by remote optical evaluation with a Ca clock
• Precision Test of Mass Ratio Variations with Lattice-Confined Ultracold Molecules
• Long-lived Bloch oscillations with bosonic Sr atoms and application to gravity measurement at micrometer scale
• ${}^{87}$Sr lattice clock with inaccuracy below 10${}^{-15}$
• A high-accuracy optical clock via three-level coherence in neutral bosonic ${}^{88}$Sr
• High-accuracy relativistic many-body calculations of van der Waals coefficients C_6 for alkaline-earth atoms
• Precision frequency measurement of visible intercombination lines of strontium
• Experimental study of the Ca2 1S+1S asymptote
• Spectroscopic determination of the s-wave scattering lengths of 86Sr and 88Sr
• Cooling and trapping of ultra-cold strontium isotopic mixtures
• Cooling of Sr to high phase-space density by laser and sympathetic cooling in isotopic mixtures

Cited by in corpus (27)

• Bose-Einstein Condensation of Strontium
• Quantum degenerate mixtures of strontium and rubidium atoms
• Double-degenerate Bose-Fermi mixture of strontium
• Creation of ultracold Sr2 molecules in the electronic ground state
• Optical Production of Stable Ultracold ${}^{88}$Sr${}_2$ Molecules
• The ^1S+^1S asymptote of Sr_2 studied by Fourier-transform spectroscopy
• Mass scaling and non-adiabatic effects in photoassociation spectroscopy of ultracold strontium atoms
• Deviations from Born-Oppenheimer mass scaling in spectroscopy and ultracold molecular physics
• Diatomic molecules of alkali-metal and alkaline-earth-metal atoms: interaction potentials, dipole moments, and polarizabilities
• Energetics and control of ultracold isotope-exchange reactions between heteronuclear dimers in external fields
• Formation of deeply bound ultracold Sr_2 molecules by photoassociation near the ^1S + ^3P_1 intercombination line
• Enhancing photoassociation rates by non-resonant light control of shape resonances
• Chemical pathways in ultracold reactions of SrF molecules
• Ultracold ${}^{88}{\mathrm{Sr}}_2$ molecules in the absolute ground state
• The states 1^1Σ^+_u, 1^1Π_u and 2^1Σ^+_u of Sr_2 studied by Fourier-transform spectroscopy
• Heteronuclear Rydberg molecules
• Atom-Number Enhancement by Shielding Atoms from Losses in Strontium Magneto-Optical Traps
• Prospects of forming high-spin polar molecules from ultracold atoms
• Electronic stress tensor analysis of molecules in gas phase of CVD process for GeSbTe alloy
• Asymptotic model for shape resonance control of diatomics by intense non-resonant light
• Universal behaviour of diatomic halo states and the mass sensitivity of their properties
• Excited electronic states of Sr${}_2$: ab initio predictions and experimental observation of the $2^1{\Sigma }_u^{+}$ state
• Scattering lengths of calcium and barium isotopes
• Ab initio electronic structure of the Sr${}_2^{+}$ molecular ion
• Photoassociative Spectroscopy of ${}^{87}$Sr
• Characterization of the electronic ground state of Mg${}_2^{+}$ by PFI-ZEKE photoelectron spectroscopy
• Ab initio study of the reactivity of ultracold RbSr$+$RbSr collisions