The Band-Spectrum of Aluminium Monofluoride

Rowlinson, H. C.; Barrow, R. F.

doi:10.1088/0370-1298/66/5/303

Cited by 39 publications

(9 citation statements)

References 9 publications

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“…Rowlinson and Barrow also reported the first observation of, what they then called, the b 3 Σ + → a 3 Π band of AlF in the 345-372 nm spectral region [66]. In 1974 a detailed study of the electronic spectrum of gaseous AlF revised the labelling of this excited 3 Σ + state [58].…”

Section: Early Characterization Of Alfmentioning

confidence: 98%

“…The A 1 Π → X 1 Σ + band was first observed in emission by Rowlinson and Barrow in 1953. They used a mixture of Al and AlF 3 in a hollow-cathode discharge [66].…”

Section: Early Characterization Of Alfmentioning

confidence: 99%

“…The A 1 Π → X 1 Σ + band was first observed in emission by Rowlinson and Barrow in 1953. They used a mixture of Al and AlF 3 in a hollow-cathode discharge [66]. From a detailed analysis of the separations of the band-heads, they obtained a first estimate of the rotational constant in the X 1 Σ + , v = 0 state of B = 0.54 cm −1 .…”

Section: Early Characterization Of Alfmentioning

confidence: 99%

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Spectroscopic characterization of aluminum monofluoride with relevance to laser cooling and trapping

et al. 2019

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Here we report on spectroscopic measurements of the aluminum monofluoride molecule (AlF) that are relevant to laser cooling and trapping experiments. We measure the detailed energy level structure of AlF in the X 1 Σ + electronic ground state, in the A 1 Π state, and in the metastable a 3 Π state. We determine the rotational, vibrational and electronic branching ratios from the A 1 Π state. We also study how the rotational levels split and shift in external electric and magnetic fields. We find that AlF is an excellent candidate for laser cooling on any Q-line of the A 1 Π -X 1 Σ + transition and for trapping at high densities.The energy levels in the X 1 Σ + , v = 0 state and within each Ω-manifold in the a 3 Π, v = 0 state are determined with a relative accuracy of a few kHz, using laser-radio-frequency multiple resonance and ionization detection schemes in a jet-cooled, pulsed molecular beam. To determine the hyperfine and Λ-doubling parameters we measure transitions throughout the 0.1 MHz -66 GHz range, between rotational levels in the X 1 Σ + , v = 0 state and between rotational and Λ-doublet levels in all three spin-orbit manifolds of the a 3 Π, v = 0 state. We measure the hyperfine splitting in the A 1 Π state using continuous wave (CW) laser-induced fluorescence spectroscopy of the A 1 Π, v = 0 ← X 1 Σ + , v = 0 band. The resolution is limited by the short radiative lifetime of the A 1 Π, v = 0 state, which we experimentally determine to be 1.90 ± 0.03 ns. The hyperfine mixing of the lowest rotational levels in the A 1 Π state causes a small loss from the the main laser cooling transition of 10 −5 . The off-diagonal vibrational branching from the A 1 Π, v = 0 state is measured to be (5.60 ± 0.02) × 10 −3 in good agreement with theoretical predictions. The strength of the spin-forbidden A 1 Π, v = 0 → a 3 Π, v = 0 transition is measured to be seven orders of magnitude lower than the strength of the A 1 Π, v = 0 → X 1 Σ + , v = 0 transition. We determine the electric dipole moments µ(X) = 1.515 ± 0.004 Debye, µ(a) = 1.780 ± 0.003 Debye and µ(A) = 1.45 ± 0.02 Debye in X 1 Σ + , v = 0, a 3 Π, v = 0 and A 1 Π, v = 0, respectively, by recording CW laser excitation spectra in electric fields up to 150 kV/cm.

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Section: Early Characterization Of Alfmentioning

confidence: 98%

“…The A 1 Π → X 1 Σ + band was first observed in emission by Rowlinson and Barrow in 1953. They used a mixture of Al and AlF 3 in a hollow-cathode discharge [66].…”

Section: Early Characterization Of Alfmentioning

confidence: 99%

Section: Early Characterization Of Alfmentioning

confidence: 99%

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Spectroscopic characterization of aluminum monofluoride with relevance to laser cooling and trapping

et al. 2019

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“…In 1953, Rowlinson and Barrow reported the first observation of transitions between triplet states in AlF by recording emission spectra from a hollow-cathode discharge [11]. In the following decades, new triplet states were identified and characterised in more detail [12][13][14][15][16].…”

Section: Previous Workmentioning

confidence: 99%

Characterisation of the b³Σ⁺, v = 0 state and its interaction with the A¹Π state in aluminium monofluoride

et al. 2020

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Recently, we determined the detailed energy level structure of the X 1 + , A 1 and a 3 states of AlF that are relevant to laser cooling and trapping experiments [Truppe et al., Phys. Rev. A. 100 (5), 052513 (2019)]. Here, we investigate the b 3 + , v = 0 state of the AlF molecule. A rotationally resolved (1 + 2)-REMPI spectrum of the b 3 + , v = 0 ← a 3 , v = 0 band is presented and the lifetime of the b 3 + , v = 0 state is measured to be 190(2) ns. Hyperfine-resolved, laser-induced fluorescence spectra of the b 3 + , v = 0 ← X 1 + , v = 1 and the b 3 + , v = 0 ← a 3 , v = 0 bands are recorded to determine fine-and hyperfine structure parameters. The interaction between the b 3 + , v = 0 and the nearby A 1 state is studied and the magnitude of the spin-orbit coupling between the two electronic states is derived using three independent methods to give a consistent value of 10(1) cm −1. The triplet character of the A state causes an A → a loss from the main A−X laser cooling cycle below the 10 −6 level.

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“…22 The spectroscopic constants for the AlF A 1 Π ← X 1 Σ + transition were taken from Rowlinson and Barrow. 23 The Franck-Condon factors for the first five vibrational levels of the Δ v = 0 transitions were taken from Liszt and Smith. 24 Due to the nearly vertical nature of the transition, the factors for five subsequent vibrational levels were estimated to be unity.…”

Section: Resultsmentioning

confidence: 99%

Ultraviolet Absorption Spectroscopy in Optically Dense Fireballs Using Broadband Second-Harmonic Generation of a Pulsed Modeless Dye Laser

Soo

Glumac

2014

Appl Spectrosc

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Broadband frequency doubling of a modeless dye laser pulse is used to enable single-shot absorption spectroscopy in the ultraviolet for optically dense, energetic-materials fireball applications. Band widths of approximately 1-3 nm are generated in the 226 and 268 nm regions using a doubling crystal. Strong focusing of the fundamental beam onto the crystal is found to be sufficient to achieve 1-5% conversion efficiency with a pulse intensity sufficient to saturate the array detector even after 75% attenuation through the fireball. The technique is demonstrated with nitric oxide (NO) absorption in a gas cell and is then used to perform the first detection and temperature fitting of aluminum monofluoride (AlF) and magnesium monofluoride (MgF) in a fireball environment.

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The Band-Spectrum of Aluminium Monofluoride

Cited by 39 publications

References 9 publications

Spectroscopic characterization of aluminum monofluoride with relevance to laser cooling and trapping

Spectroscopic characterization of aluminum monofluoride with relevance to laser cooling and trapping

Characterisation of the b³Σ⁺, v = 0 state and its interaction with the A¹Π state in aluminium monofluoride

Ultraviolet Absorption Spectroscopy in Optically Dense Fireballs Using Broadband Second-Harmonic Generation of a Pulsed Modeless Dye Laser

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The Band-Spectrum of Aluminium Monofluoride

Cited by 39 publications

References 9 publications

Spectroscopic characterization of aluminum monofluoride with relevance to laser cooling and trapping

Spectroscopic characterization of aluminum monofluoride with relevance to laser cooling and trapping

Characterisation of the b3Σ+, v = 0 state and its interaction with the A1Π state in aluminium monofluoride

Ultraviolet Absorption Spectroscopy in Optically Dense Fireballs Using Broadband Second-Harmonic Generation of a Pulsed Modeless Dye Laser

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Characterisation of the b³Σ⁺, v = 0 state and its interaction with the A¹Π state in aluminium monofluoride