The A1Π-X1Σ+ transition of AlCl

Mahieu, Emmanuel; Dubois, I.; Bredohl, H.

doi:10.1016/0022-2852(89)90319-6

Cited by 27 publications

(27 citation statements)

References 3 publications

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“…A reliable line list to calculate molecular opacities can be obtained through a combination of laboratory data and ab initio calculations. Mahieu et al (1989) measured a highresolution electronic spectrum of the A 1 Π-X 1 Σ + transition of AlCl. Hedderich et al (1993) reported on high-resolution spectra of Al 35 Cl and Al 37 Cl up to v=8 and J=167.…”

Section: Introductionmentioning

confidence: 99%

Line Lists for AlF and AlCl in the X¹Σ⁺ Ground State

Yousefi

Bernath

2018

ApJS

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Vibration-rotation line lists for AlF, Al 35 Cl, and Al 37 Cl have been prepared in their ground electronic states (X 1 S +). Experimental rotational and ro-vibrational lines were employed to calculate a potential energy surface (PES) by direct potential fitting. The PES was used to calculate ro-vibrational energy levels. Born-Oppenheimer Breakdown corrections were included in the energy level calculations for AlCl. Ro-vibrational energy levels were calculated for the v=0 to v=11 vibrational levels and up to J max =200 for the rotational levels. Dipole moment functions covering the range of the PES turning points were calculated for AlCl and AlF by ab initio methods and used to determine line intensities. Partition functions for temperatures up to 3000 K were calculated. AlF and AlCl have been detected in circumstellar envelopes and are predicted to occur in cool stellar and sub-stellar atmospheres.

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Section: Introductionmentioning

confidence: 99%

Line Lists for AlF and AlCl in the X¹Σ⁺ Ground State

Yousefi

Bernath

2018

ApJS

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“…The first experimental observation of the A 1 -X 1 + transition of AlCl was presented by Bhaduri & Fowler (1934). This system was later confirmed by Holst (1935) and analysed at high resolution by Mahieu, Dubois & Bredohl (1989a). Sharma (1951) reported the identification of the a 3 -X 1 + and b 3 + -a 3 systems.…”

Section: R E S U Lt S a N D Discussionmentioning

confidence: 86%

Formation of AlCl by radiative association

Andreazza

Almeida

Vichietti

2018

Monthly Notices of the Royal Astronomical Society

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The rate coefficient for the formation of aluminium monochloride, AlCl, from the radiative association of aluminium and chlorine atoms is estimated as a function of temperature. The coupling of the Al and Cl atoms through the A 1 molecular electronic state, which undergoes radiative transition to the X 1 + ground state, is the most efficient transition to form AlCl. The rate constant was found to vary with temperature according to the expressions k(T) = 1.22 × 10 −16 (T/300) 0.40 exp (−748/T) cm 3 s −1 for temperatures between 300 and 1000 K, and k(T) = 2.20 × 10 −16 (T/300) 0.175 exp (−1067/T) cm 3 s −1 for temperatures between 1000 and 14 000 K.

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“…The production of gas phase AlCl for spectroscopic measurements has most commonly been accomplished by heating or putting a discharge through AlCl 3 . [60][61][62][63][64][65][66][67] High temperature ovens have also been used to react Al vapor with separate sources of Cl atoms, including gases like Cl 2 and HCl, 66,68,69 as well as vaporized solids like MgCl 2 , AgCl, and AlCl 3 . [70][71][72][73] These high temperature sources produce translationally hot molecules and generate a heavy thermal load.…”

Section: Introductionmentioning

confidence: 99%

Optimizing Pulsed-Laser Ablation Production of AlCl Molecules for Laser Cooling

Lewis,

Wang,

Daniel

et al. 2021

Preprint

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Aluminum monochloride (AlCl) has been proposed as a promising candidate for laser cooling to ultracold temperatures, and recent spectroscopy results support this prediction. It is challenging to produce large numbers of AlCl molecules because it is a highly reactive open-shell molecule and must be generated in situ. Here we show that pulsed-laser ablation of stable, non-toxic mixtures of Al with an alkali or alkaline earth chlorides, denoted XCl n , can provide a robust and reliable source of cold AlCl molecules. Both the chemical identity of XCl n and the Al:XCl n molar ratio are varied, and the yield of AlCl is monitored using absorption spectroscopy in a cryogenic gas.For KCl, the production of Al and K atoms was also monitored. We model the AlCl production in the limits of nonequilibrium recombination dominated by first-encounter events. The non-equilibrium model is in agreement with the data and also reproduces the observed trend with different XCl n precursors. We find that AlCl production is limited by the solid-state densities of Al and Cl atoms and the recondensation of Al atoms in the ablation plume. We suggest future directions for optimizing the production of cold AlCl molecules using laser ablation.

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The A1Π-X1Σ+ transition of AlCl

Cited by 27 publications

References 3 publications

Line Lists for AlF and AlCl in the X¹Σ⁺ Ground State

Line Lists for AlF and AlCl in the X¹Σ⁺ Ground State

Formation of AlCl by radiative association

Optimizing Pulsed-Laser Ablation Production of AlCl Molecules for Laser Cooling

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The A1Π-X1Σ+ transition of AlCl

Cited by 27 publications

References 3 publications

Line Lists for AlF and AlCl in the X1Σ+ Ground State

Line Lists for AlF and AlCl in the X1Σ+ Ground State

Formation of AlCl by radiative association

Optimizing Pulsed-Laser Ablation Production of AlCl Molecules for Laser Cooling

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Product

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Line Lists for AlF and AlCl in the X¹Σ⁺ Ground State

Line Lists for AlF and AlCl in the X¹Σ⁺ Ground State