Photoassociation spectroscopy of cold alkaline earth atoms near the intercombination line

Abstract

The properties of photoassociation (PA) spectra near the intercombination line (the weak transition between ${}^1{S}_0$ and ${}^3{P}_1$ states) of group II atoms are theoretically investigated. As an example we have carried out a calculation for Calcium atoms colliding at ultra low temperatures of 1 mK, 1 $\mu$K, and 1 nK. Unlike in most current photoassociation spectroscopy the Doppler effect can significantly affect the shape of the investigated lines. Spectra are obtained using Ca--Ca and Ca--Ca${}^{\ast }$ short-range {\it ab initio} potentials and long-range van der Waals and resonance dipole potentials. The similar van der Waals coefficients of ground ${}^1{S}_0{+}^1{S}_0$ and excited ${}^1{S}_0{+}^3{P}_1$ states cause the PA to differ greatly from those of strong, allowed transitions with resonant dipole interactions. The density of spectral lines is lower, the Condon points are at relatively short range, and the reflection approximation for the Franck-Condon factors is not applicable, and the spontaneous decay to bound ground-state molecules is efficient. Finally, the possibility of efficient production of cold molecules is discussed.

References in corpus (12)

• Further Evidence for Cosmological Evolution of the Fine Structure Constant
• Recoil-free spectroscopy of neutral Sr atoms in the Lamb-Dicke regime
• Photoassociation of sodium in a Bose-Einstein condensate
• Spectroscopy of the ${}^1{S}_0-{}^3{P}_0$ Clock Transition of ${}^{87}$Sr in an Optical Lattice
• An Optical Clock with Ultracold Neutral Atoms
• High-accuracy relativistic many-body calculations of van der Waals coefficients C_6 for alkaline-earth atoms
• Calculations of collisions between cold alkaline earth atoms in a weak laser field
• Experimental study of the Ca2 1S+1S asymptote
• Photoassociation spectroscopy of cold calcium atoms
• Improved LeRoy-Bernstein near-dissociation expansion formula. Tutorial application to photoassociation spectroscopy of long-range states
• Quenched narrow-line second- and third-stage laser cooling of 40Ca
• Subthermal linewidths in photoassociation spectra of cold alkaline earth atoms

Cited by in corpus (27)

• Bose-Einstein Condensation of Strontium
• Nuclear Spin Effects in Optical Lattice Clocks
• Bose-Einstein condensation of alkaline earth atoms: ${}^{40}${Ca}
• Systematic study of Optical Feshbach Resonances in an ideal gas
• Optical tuning of the scattering length of cold alkaline earth atoms
• Narrow Line Photoassociation in an Optical Lattice
• Two-photon photoassociative spectroscopy of ultracold 88-Sr
• Photoassociative spectroscopy at long range in ultracold strontium
• Spectroscopic determination of the s-wave scattering lengths of 86Sr and 88Sr
• Optical Feshbach resonances: Field-dressed theory and comparison with experiments
• Isotope-shift spectroscopy of the ${}^1{S}_0\to {}^3{P}_1$ and ${}^1{S}_0\to {}^3{P}_0$ transitions in strontium
• Controlled Production of Sub-Radiant States of a Diatomic Molecule in an Optical Lattice
• Bose-Einstein condensation of 86Sr
• Mass scaling and non-adiabatic effects in photoassociation spectroscopy of ultracold strontium atoms
• Thermometry via Light Shifts in Optical Lattices
• Optical lattice clocks with weakly bound molecules
• Formation of deeply bound ultracold Sr_2 molecules by photoassociation near the ^1S + ^3P_1 intercombination line
• Optical repumping of triplet $P$-states enhances magneto-optical trapping of ytterbium atoms
• Engineering an all-optical route to ultracold molecules in their vibronic ground state
• Study of coupled states for the (4s^{2})^{1}S + (4s4p)^{3}P asymptote of Ca_{2}
• Modeling Particle Loss in Open Systems using Keldysh Path Integral and Second Order Cumulant Expansion
• Ground-state properties of Ca${}_2$ from narrow line two-color photoassociation
• Optical Feshbach resonances and ground state molecule production in the RbHg system
• Precise measurements of optical Feshbach resonances of ${}^{174}$Yb atoms
• Heteronuclear fermionic superfluids with spin degrees of freedom
• Photoassociation spectroscopy of ultracold ${}^{173}$Yb atoms near the intercombination line
• Nonlinear Zeeman effect in photoassociation spectra of ${}^{40}$Ca near the ${}^3$P${}_1$+${}^1$S${}_0$ asymptote