Spectroscopy on the $A^1\Pi \leftarrow X^1{\Sigma }^{+}$ Transition of Buffer-Gas Cooled AlCl

Abstract

Aluminum monochloride (AlCl) has been proposed as an excellent candidate for laser cooling. Here we present absorption spectroscopy measurements on the $A^1\Pi \leftarrow X^1{\Sigma }^{+}$ transition in AlCl inside a cryogenic helium buffer-gas beam cell. The high resolution absorption data enables a rigorous, quantitative comparison with our high-level ab initio calculations of the electronic and rovibronic energies, providing a comprehensive picture of the AlCl quantum structure. The combination of high resolution spectral data and theory permits the evaluation of spectroscopic constants and associated properties, like equilibrium bond length, with an order of magnitude higher precision. Based on the measured molecular equilibrium constants of the $A^1\Pi$ state, we estimate a Franck-Condon factor of the $A^1\Pi \leftarrow X^1{\Sigma }^{+}$ of 99.88%, which confirms that AlCl is amenable to laser cooling.

arXiv commentv2: 14 pages, 6 figures, Added more Theory material (III), added more elaboration on some details, mild formatting and arrangement changes, fixed typos v1: 13 pages, 5 figures

References in corpus (59)

• The chemical composition of the Sun
• A High Phase-Space-Density Gas of Polar Molecules
• Quantum computation with trapped polar molecules
• Cold and Ultracold Molecules: Science, Technology, and Applications
• A toolbox for lattice spin models with polar molecules
• Order of Magnitude Smaller Limit on the Electric Dipole Moment of the Electron
• Quantum-State Controlled Chemical Reactions of Ultracold KRb Molecules
• Dipolar collisions of polar molecules in the quantum regime
• Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state
• Optical Production of Ultracold Polar Molecules
• Ultracold Dipolar Gas of Fermionic ${}^{23}$Na${}^{40}$K Molecules in their Absolute Ground State
• Magneto-optical trapping of a diatomic molecule
• Creation of ultracold ${}^{87}$RbCs molecules in the rovibrational ground state
• A precision measurement of the electron's electric dipole moment using trapped molecular ions
• The Buffer Gas Beam: An Intense, Cold, and Slow Source for Atoms and Molecules
• Molecules cooled below the Doppler limit
• Creation of an ultracold gas of ground-state ${}^{23}{\mathrm{Na}}^{87}\mathrm{Rb}$ molecules
• Quantum gas of rovibronic ground-state molecules in an optical lattice
• Schemes for robust quantum computation with polar molecules
• A Fermi Degenerate Gas of Polar Molecules
• Precision Measurement of Time-Reversal Symmetry Violation with Laser-Cooled Polyatomic Molecules
• Sisyphus Laser Cooling of a Polyatomic Molecule
• Radio Frequency Magneto-Optical Trapping of CaF with High Density
• Coherent transfer of photoassociated molecules into the rovibrational ground state
• The 2020 release of the ExoMol database: molecular line lists for exoplanet and other hot atmospheres
• Laser Cooling of Optically Trapped Molecules
• Building one molecule from a reservoir of two atoms
• 3-D Magneto-Optical Trap of Yttrium Monoxide
• Ultracold molecules for measuring the electron's electric dipole moment
• Lasercooled RaF as a promising candidate to measure molecular parity violation
• Magneto-Optical Trap for Polar Molecules
• Direct Laser Cooling of a Symmetric Top Molecule
• Evaporative cooling of the dipolar radical OH
• Laser-Cooled Polyatomic Molecules for Improved Electron Electric Dipole Moment Searches
• Polyatomic candidates for cooling of molecules with lasers from simple theoretical concepts
• Molecular abundances in the inner layers of IRC +10216
• Measuring the electric dipole moment of the electron in BaF
• Magnetically-Trapped Molecules Efficiently Loaded from a Molecular MOT
• Polyatomic Molecules as Quantum Sensors for Fundamental Physics
• Collisions of ultracold ^{23}Na^{87}Rb molecules with controlled chemical reactivities
• Magnetic trapping and coherent control of laser-cooled molecules
• Collisional Cooling of Ultracold Molecules
• 1D Magneto-Optical Trap of Polyatomic Molecules
• A Scalable Quantum Computing Platform Using Symmetric-Top Molecules
• Tracing the phase transition of Al-bearing species from molecules to dust in AGB winds. Constraining the presence of gas-phase (Al2O3)n clusters
• Characteristics of a magneto-optical trap of molecules
• Methods for measuring the electron EDM using ultracold YbF molecules
• Spectroscopic characterization of aluminum monofluoride with relevance to laser cooling and trapping
• Buffer-gas cooling, high-resolution spectroscopy and optical cycling of barium monofluoride molecules
• Probing Fundamental Symmetries of Deformed Nuclei in Symmetric Top Molecules
• Hyperfine Structure of the $B^3{\Pi }_1$ State and Predictions of Optical Cycling Behavior in the $X\to B$ transition of TlF
• Detection of Formaldehyde Towards the Extreme Carbon Star IRC+10216
• Coherent Bichromatic Force Deflection of Molecules
• Radiative deflection of a BaF molecular beam from the optical cycling
• High-resolution optical spectroscopy with a buffer-gas-cooled beam of BaH molecules
• Hypermetallic Polar Molecules for Precision Measurements
• Empirical Line Lists in the ExoMol Database
• Characterisation of the $b^3{\Sigma }^{+},v=0$ State and Its Interaction with the $A^1\Pi$ State in Aluminium Monofluoride
• Microwave trap for atoms and molecules

Cited by in corpus (13)

• Cryogenic Buffer Gas beams of AlF, CaF, MgF, YbF, Al, Ca, Yb and NO -- a comparison
• Doppler cooling of buffer-gas-cooled Barium monofluoride molecules
• Towards improved loading, cooling, and trapping of molecules in magneto-optical traps
• Saturated absorption spectroscopy of buffer-gas-cooled Barium monofluoride molecules
• Multivalent optical cycling centers in polyatomic molecules
• Laser cooling of molecules
• Nuclear spin relaxation in cold atom-molecule collisions
• Hyperfine structure of the ${\mathbf{A}}^1\mathbf{\Pi }$ state of AlCl and its relevance to laser cooling and trapping
• Measurement of the Electric Dipole Moment of AlCl by Stark Level Spectroscopy
• Low Duty Cycle Pulsed UV Technique for Spectroscopy of Aluminum Monochloride
• Highly spin-polarized molecules via collisional microwave pumping
• Optimizing Pulsed-Laser Ablation Production of AlCl Molecules for Laser Cooling
• A stable 2 W continuous-wave 261.5 nm laser for cooling and trapping aluminum monochloride